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Which of the following pairs of animal phyla are the most closely related

User Lexspoon
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C. annelids and flatworms since they are both worms

User Yahia Reyhani
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There are three phyla that categorizes worms which are platyhelminthes (flatworms), nematodes (round worms) and annelids (segmented worms).In this case, the pair that is closely related is C. annelids and flatworms since they are both worms
User LeGEC
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