In earthworms, what do the nerve cord, the setae, the circular muscles, and the metanephridia have in common?
A. They all play a role in excretion of waste from the body.
B. They are serially repeated in the body segments of the body.
C. They all play a role in the reproductive activities of the earthworm.
D. They are all used in locomotion.
Answer: B
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