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In earthworms, what do the nerve cord, the setae, the circular muscles, and the metanephridia have in common?.
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In earthworms, what do the nerve cord, the setae, the circular muscles, and the metanephridia have in common?.

User AlphaBetaGamma
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They are serially repeated in the segments of the body. has programmed cell death and therefore is useful in cancer and AIDS research.

User Margret
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