3.
which is not a way that overgrazing affects an ecosystem?

a. causes less plants to grow
b. makes it easier for soil to blow away
c. makes it easier for animals to find plants to eat
d. forces animals to move away from the ecosystem

4. what is a tree line?
a. the height of trees in a certain biome
b. the type of trees in a biome
c. the place where trees stop growing because the climate is too harsh
d. the number of trees that can grow in a biome

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