What are the characteristic structural features of the earthworm, what is its significance in nature?

As a representative of annelids, the earthworm has a body of segments – rings. He has a secondary body cavity and a circulatory system. As in small-bristled worms – each ringlet has 8 bristles. As an inhabitant of the soil, it has an elongated body capable of contracting with the help of muscles, the skin is covered with mucus, which facilitates movement and makes breathing possible, and the bristles also contribute to movement. Worms participate in soil formation processes, enrich the soil with air and serve as food for other animals.