Which of the following structures DOES NOT occur in a series of successive segments of an earthworm?

Name: Which of the following structures DOES NOT occur in a series of successive segments of an earthworm?
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The crop in an earthworm is a storage organ for food and does not occur in a series of successive segments like the other structures listed. Structures such as the nerve cord, setae, circular muscles, and metanephridia are repeated in each segment of an earthworm's body.

Which of the Following Structures DOES NOT Occur in a Series