(D) In the earthworm ($Pheretima$ $posthuma$),the body is divided into segments called metameres. Each segment,except for the first,the last,and the c

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first,last,and clitellar segments

(D) In the earthworm ($Pheretima$ $posthuma$),the body is divided into segments called metameres. Each segment,except for the first,the last,and the clitellum,bears $S$-shaped structures called setae. Setae are primarily involved in locomotion. Therefore,the correct answer is $D$.