Answer:
Earthworms are a decomposer (D)
Explanation:
They break down things that are dead. Like breaking down dead roots making room for new ones to come in. Also using process of elimination you could take out (b) because it doesn't make food from the sun, abiotic factor is sum that isn't alive so that wouldn't make sense and (C) wouldn't either. So the answer will be (D). Decomposer.
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