Which one of the following phyla is character | vedclass

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(D) true coelom is a body cavity which is lined by mesoderm on all sides.Phylum $Nematoda$ (also known as $Aschelminthes$) is characterized by the pre

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Nematoda

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(D) true coelom is a body cavity which is lined by mesoderm on all sides.Phylum $Nematoda$ (also known as $Aschelminthes$) is characterized by the presence of a pseudocoelom,where the body cavity is not lined by mesoderm but instead,the mesoderm is present as scattered pouches in between the ectoderm and endoderm.Phyla $Echinodermata$,$Mollusca$,and $Annelida$ are all coelomates,meaning they possess a true coelom.Therefore,$Nematoda$ is the correct answer as it lacks a true coelom.

Which one of the following phyla is characterized by the absence of a true coelom?

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