The type of body cavity seen in the roundworms that develops between mesoderm and endoderm layers is a:

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Roundworms have a pseudocoelom, which is a body cavity that develops between the mesoderm and endoderm layers. A pseudocoelom is not completely lined with mesoderm, which distinguishes it from a true coelom found in higher animals. Mantle is a layer of tissue that secretes the shell in mollusks, and acoelomate organisms lack a body cavity altogether.

The Type of Body Cavity Seen in the Roundworms That