This is an option of a c-map to study the different types of worms. Worms is not a taxonomical category. Nematodes, platyheminthes and annelids are taxa (each of them is a phylum, in this case, like, mollusc, or arthropods). But people usually group them with the common name "worms".
Remember, annelids have segments that are equal externally nd internally. This segments are called METAMERS.
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