Earthworms live in many grass and forest ecosystems, and they aerate the soil as they burrow. They also may mix soil layers as they ingest organic matter and travel between layers. These traits, taken collectively, make up the of the earthworm.

Question

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The traits and roles of the earthworm in the ecosystem, such as aerating the soil and mixing soil layers, collectively define its niche.

Earthworms Live in Many Grass and Forest Ecosystems, and They