The first animal phylum to possess a true coe | vedclass

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(C) The $true \ coelom$ (or $eucoelom$) is a body cavity that is completely lined by mesoderm. In the evolutionary hierarchy of animals,$Annelida$ is

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Annelida

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(C) The $true \ coelom$ (or $eucoelom$) is a body cavity that is completely lined by mesoderm. In the evolutionary hierarchy of animals,$Annelida$ is the first phylum to exhibit a true coelom. $Platyhelminthes$ are acoelomate,$Aschelminthes$ (Nematoda) are pseudocoelomate,and $Annelida$ marks the beginning of the coelomate condition.

Column-$I$ (Animal)	Column-$II$ (Genus)
$P$. Sandworm	$I$. Nereis
$Q$. Earthworm	$II$. Hirudinaria
$R$. Leech	$III$. Pheretima

The first animal phylum to possess a true coelom is:

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Column-$I$ (Animal) Column-$II$ (Genus)
$P$. Sandworm $I$. Nereis
$Q$. Earthworm $II$. Hirudinaria
$R$. Leech $III$. Pheretima

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