How is locomotion achieved in earthworms?

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(C) Locomotion in earthworms is primarily achieved through the contraction and relaxation of the body wall muscles. $1$. The body wall contains both c

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Periodic contraction of body segments

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(C) Locomotion in earthworms is primarily achieved through the contraction and relaxation of the body wall muscles. $1$. The body wall contains both circular and longitudinal muscles. $2$. The contraction and relaxation of these muscles result in the periodic shortening and lengthening of the body segments,which facilitates movement. $3$. Setae (present in all segments except the first,last,and clitellum) help in gripping the ground during this process. $4$. Therefore,the periodic contraction and relaxation of body segments is the fundamental mechanism for locomotion.

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