6-ecosystems

 1) An ecosystem consists of organism and... > > >
 * 1) living things
 * 1) terrestrial environment
 * 1) aquatic environment
 * 1) **physical environment **

2) An example of terrestrial ecosystems can be... > > >
 * 1) forest, mountain grasslands and rivers
 * 1) **<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">dessert and steppes **
 * 2) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">forest, mountain grasslands and ocean
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Only a forest

<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">3) Every ecosystem has a particular fauna, wich are all the animals and flora

> > >
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;">**<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">True **
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">True depending on some ecosystems where there are not animals and flora
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">False
 * 1) <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Answers 1. and 2. are correct

<span style="background-color: #ffffff; color: #000000; display: block; font-family: "Times New Roman"; font-size: 16px; text-align: left; text-decoration: none;"><span style="background-color: transparent; color: #292a3a; font-family: Verdana; font-size: 12px; text-decoration: none; vertical-align: baseline;">4) <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">pollution is the accumulation of rubbish and harmful substances in... > > >
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Air
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;">**<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Air, soil and water **
 * 2) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Air, dump and water
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Air and water

<span style="background-color: #ffffff; color: #000000; display: block; font-family: "Times New Roman"; font-size: 16px; text-align: left; text-decoration: none;"><span style="background-color: transparent; color: #292a3a; font-family: Verdana; font-size: 12px; text-decoration: none; vertical-align: baseline;">5) <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">An important consequence of pollution is > > >
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Global warnming
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Social concern
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">illness
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;">**<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Global warming **

<span style="background-color: #ffffff; color: #000000; display: block; font-family: "Times New Roman"; font-size: 16px; text-align: left; text-decoration: none;"><span style="background-color: transparent; color: #292a3a; font-family: Verdana; font-size: 12px; text-decoration: none; vertical-align: baseline;">6) <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">The slow transformation of fertile land into desert is what is known as... > > >
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Deforestation
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Overexploitation
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;">**<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Desertification **
 * 2) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Pollution

<span style="background-color: #ffffff; color: #000000; display: block; font-family: "Times New Roman"; font-size: 16px; text-align: left; text-decoration: none;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">7) ... are organisms and fungi that break down dead animal and plant materials, feeding on them. > >
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;">**<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Scavengers and decomposer **
 * 2) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Producers
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Consumers
 * 1) <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Producers and consumers

<span style="background-color: #ffffff; color: #000000; display: block; font-family: "Times New Roman"; font-size: 16px; text-align: left; text-decoration: none;"><span style="background-color: transparent; color: #292a3a; font-family: Verdana; font-size: 12px; text-decoration: none; vertical-align: baseline;">8) <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Mutualism is the relationship between two... > > >
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">species when one benefits and other remains unaffected
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">species when one benefits while the other suffers
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">different species that have the same needs
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;">**<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">species when both benefit **

<span style="background-color: #ffffff; color: #000000; display: block; font-family: "Times New Roman"; font-size: 16px; text-align: left; text-decoration: none;"><span style="background-color: transparent; color: #292a3a; font-family: Verdana; font-size: 12px; text-decoration: none; vertical-align: baseline;">9) <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Commensalism is the relationship between two... > > >
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;">**<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">species when one benefits and other remains unaffected **
 * 2) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">species when one benefits while the other suffers
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">species that have the same needs
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">species when both benefit.

<span style="background-color: #ffffff; color: #000000; display: block; font-family: "Times New Roman"; font-size: 16px; text-align: left; text-decoration: none;"><span style="background-color: transparent; color: #292a3a; font-family: Verdana; font-size: 12px; text-decoration: none; vertical-align: baseline;">10) <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Some examples of marine ecosystems can be... > > >
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Sandy beaches and lagoons
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Sandy beaches and rivers
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;">**<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Sandy beaches, open sea and rocky shores **
 * 2) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Sandy beaches, open sea, rivers and oceans.

<span style="background-color: #ffffff; color: #000000; display: block; font-family: "Times New Roman"; font-size: 16px; text-align: left; text-decoration: none;"><span style="background-color: transparent; color: #292a3a; font-family: Verdana; font-size: 12px; text-decoration: none; vertical-align: baseline;">11) <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Which is the name of this relationship? > > >
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Competition
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Parasitism
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;">**<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Commensalism **
 * 2) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Mutualism

<span style="background-color: #ffffff; color: #000000; display: block; font-family: "Times New Roman"; font-size: 16px; text-align: left; text-decoration: none;"><span style="background-color: transparent; color: #292a3a; font-family: Verdana; font-size: 12px; text-decoration: none; vertical-align: baseline;">12) <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Herbaceous plants are mainly found... > > >
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;">**<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">in mountain grasslands **
 * 2) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">on sandy beaches
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">in the ocean
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">in deserts and steppes

<span style="background-color: #ffffff; color: #000000; display: block; font-family: "Times New Roman"; font-size: 16px; text-align: left; text-decoration: none;"><span style="background-color: transparent; color: #292a3a; font-family: Verdana; font-size: 12px; text-decoration: none; vertical-align: baseline;">13) <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">In a food chain a primary consumer is: > > >
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">herbivore and feed on decomposers
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">carnivore and feed on tertiary consumers
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">carnivore and feed on producers
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;">**<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">herbivore and feed on producers **

<span style="background-color: #ffffff; color: #000000; display: block; font-family: "Times New Roman"; font-size: 16px; text-align: left; text-decoration: none;"><span style="background-color: transparent; color: #292a3a; font-family: Verdana; font-size: 12px; text-decoration: none; vertical-align: baseline;">14) <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">What does "Endangered species" mean? ** THIS QUESTION IS CONFUSING, I still think so this second round ** > > >
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Living things at risk of becoming plenty
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;">**<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Is a consequence of overexploitation **
 * 2) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">When we use up animals slower than they reproduce
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Animals (only) in danger of disappearing

<span style="background-color: #ffffff; color: #000000; display: block; font-family: "Times New Roman"; font-size: 16px; text-align: left; text-decoration: none;"><span style="background-color: transparent; color: #292a3a; font-family: Verdana; font-size: 12px; text-decoration: none; vertical-align: baseline;">15) <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Freshwater ecosystems**:** > > > >
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Has low salinity and the water is always still
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;">**<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Has low salinity and depending, on the type, the water moves or stays still **
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Has high salinity and moves due to the waves
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Has high salinity and moves due to the currents

<span style="background-color: #ffffff; color: #000000; display: block; font-family: "Times New Roman"; font-size: 16px; text-align: left; text-decoration: none;"><span style="background-color: transparent; color: #292a3a; font-family: Verdana; font-size: 12px; text-decoration: none; vertical-align: baseline;">16) <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">An example of a tertiary consumers could be... > >
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Mouse
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;">**<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Eagles **
 * 2) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Algae
 * 1) <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Shrew

<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">17) One of the following is not a terrestrial ecosystem:

<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;"> 1. Tundra <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;"> 2. Deserts <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;"> 3. Mountain grassland

<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;"> 4. Wetland
<span style="background-color: #ffffff; color: #000000; display: block; font-family: "Times New Roman"; font-size: 16px; text-align: left; text-decoration: none;"><span style="background-color: transparent; color: #292a3a; font-family: Verdana; font-size: 12px; text-decoration: none; vertical-align: baseline;">18) <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">All the organisms of one species make up a... > > >
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Community
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Specie
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;">**<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Population **
 * 2) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Organism

<span style="background-color: #ffffff; color: #000000; display: block; font-family: "Times New Roman"; font-size: 16px; text-align: left; text-decoration: none;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">19) The accumulation of rubbish and harmful substances is.. > > >
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">**Pollution**
 * 2) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Deforestation
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Desertification
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">Endangered species

<span style="background-color: #ffffff; color: #000000; display: block; font-family: "Times New Roman"; font-size: 16px; text-align: left; text-decoration: none;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">20) Environment refers to: > > >
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">animals and plants
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">food chains and food webs
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;">**<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">living and non-living things **
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">non living things in a ecosystem

<span style="background-color: #ffffff; color: #000000; display: block; font-family: "Times New Roman"; font-size: 16px; text-align: left; text-decoration: none;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">21) One of the following is not an aquatic ecosystem: > > >
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">ocean
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">river
 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;">**<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">tundra **
 * 2) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">wetland

<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">21) How many types of ecosystems are there?

<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;"> 1. Land and marine ecosystems <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;"> 2. Terrestrial and marine ecosystems <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;"> 3. Marine and freshwater ecosystems <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;"> 4. **Terrestrial and aquatic ecosystems**

<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">22) What does desertification consist of?


 * <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;"> 1. Water an wind carry away the fertile layer of soil **

<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">2. Forest fires or people cut down too many trees <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">3. Living things become extinct <span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;"> 4. Rubbish accumulates and this promotes acid rain

<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">23) Competition is the relationship between two...


 * 1) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">species when one benefits and other remains unaffected
 * 2) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">species when one benefits while the other suffers
 * 3) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;">**<span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">species that have the same needs **
 * 4) <span style="background-color: transparent; color: #393a68; display: block; font-family: Verdana; font-size: 16px; text-align: left; text-decoration: none; vertical-align: baseline;"><span style="background-color: transparent; color: #393a68; font-family: Verdana; font-size: 14px; text-decoration: none; vertical-align: baseline;">species when both benefit