A) Ringworm
B) Flatworm
C) Earthworm
D) Silkworm
Correct Answer: C
Solution :
Earthworms are present in top soil. Earthworm is popularly known as the farmer's friend or as nature's ploughman because of its activities in the soil. It makes burrows into the soil, thus mixing the soil well, and its excreta called worm cast enriches the soil with nitrogen.
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