How does an earthworm move?

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(D) The movement in an earthworm is facilitated by the contraction and relaxation of its body wall muscles.Specifically,the earthworm possesses both c

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Setae and muscles

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(D) The movement in an earthworm is facilitated by the contraction and relaxation of its body wall muscles.Specifically,the earthworm possesses both circular and longitudinal muscles.Additionally,the earthworm has $S$-shaped structures called setae,which are embedded in the epidermal pits of each segment (except the first,last,and clitellum).These setae help in gripping the soil and provide anchorage during locomotion.Therefore,the coordinated action of muscles and the grip provided by the setae allow the earthworm to move effectively.

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