Decomposers are an important part of
the ecosystem,
them to
return needed nutrients to the soil.
a. yet plants don't depend on
b. but plants don't need
c. and plants rely on
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The answer is C. and plants rely on

Explanation:

This is the answer because when animals die, they are full of nutrients that decomposers break down. Plants need nutrients to survive. The dead animals  nutrients can go into the ground. When I say this, think of compost. You put it into the ground and a plant takes that nutrients as well as water and sunlight to grow and become a fully developed plant, like a tree. The earth soaks or takes in nutrients through the soil.