What is the usual morphological feature of nematodes, Biology

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Q. What is the usual morphological feature of nematodes that differentiates them from platyhelminthes?

Nematodes are also called as roundworms. As the name indicates they are not flat like platyhelminthes. In evolutionary grounds with the nematodes the first complete digestive system appears, with anus and mouth, and the pseudocoelom is too a novelty.


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