Give the characteristics of flat worms, round worms and segmented worms. Give their phylum
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Solution
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Segmented worms: They belong to phylum Annelida. Have a true coelom which forms within the mesoderm (Coelomate) Flatworms: They belong to phylum platyhelminthes. Have three germ layers, but no coelom. (Acoelomate) Roundworms: They belong to phylum Nematoda. Have a cavity that forms between the mesoderm and the endoderm. (Pseudocoelomate)