Which of the following phyla is the first to | vedclass

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(C) true coelom is a body cavity that is completely lined by mesoderm. Among the given options,the phylum $Annelida$ is the first group of animals in

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Annelida

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(C) true coelom is a body cavity that is completely lined by mesoderm. Among the given options,the phylum $Annelida$ is the first group of animals in the evolutionary sequence to exhibit a true coelom (eucoelomate condition). $Platyhelminthes$ are acoelomate,and $Aschelminthes$ (Nematoda) are pseudocoelomate. Therefore,$Annelida$ represents the first appearance of a true coelom in the animal kingdom.

Which of the following phyla is the first to possess a true coelom?

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