The body of the earthworm is made of many rings which are joined end to end. These rings help the earthworm to move forward. The muscles in the body help the earthworm to extend and shorten its body. At first, the front portion of the body extends and the rear portion of the body remains fixed to the ground. Then the earthworm fixes the front end and releases its rear end. This helps it to shorten its body and to move forward. By repeating the same movement by contracting and relaxing the muscles, the earthworm moves ahead.
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