In which of the following is the body cavity | vedclass

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(A) The body cavity that is not lined by a mesodermal cellular layer is known as a pseudocoelom.In $Nematodes$ (Phylum $Aschelminthes$),the body cavit

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Nematodes

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(A) The body cavity that is not lined by a mesodermal cellular layer is known as a pseudocoelom.In $Nematodes$ (Phylum $Aschelminthes$),the body cavity is formed from the blastocoel and is not lined by mesoderm,hence they are called pseudocoelomates.$Platyhelminthes$ are acoelomates (no body cavity).$Annelids$ and $Echinoderms$ are true coelomates (possess a body cavity lined by mesoderm).

In which of the following is the body cavity surrounding the alimentary canal not lined by a cellular layer?

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