Which animal group possesses a pseudocoelom?

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(C) In animals,the body cavity is a space between the body wall and the gut wall. If the body cavity is not lined by mesoderm,but instead,the mesoderm

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Aschelminthes (Nematodes)

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(C) In animals,the body cavity is a space between the body wall and the gut wall. If the body cavity is not lined by mesoderm,but instead,the mesoderm is present as scattered pouches in between the ectoderm and endoderm,such a body cavity is called a pseudocoelom. Phylum $Aschelminthes$ (also known as Nematodes) is the only group among the given options that exhibits this characteristic. Echinoderms,Molluscs,and Annelids are coelomates,meaning they possess a true coelom lined by mesoderm.

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