The first phylum of animals to exhibit a true | vedclass

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(C) The true coelom is a body cavity that is completely lined by mesoderm. In the animal kingdom,the phylum $Annelida$ is the first group to possess a

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Annelida

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(C) The true coelom is a body cavity that is completely lined by mesoderm. In the animal kingdom,the phylum $Annelida$ is the first group to possess a true coelom (eucoelom). $Platyhelminthes$ are acoelomates,$Cnidaria$ are diploblastic and lack a body cavity,and while $Arthropoda$ are coelomates,they appear later in the evolutionary sequence than $Annelida$.

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

The first phylum of animals to exhibit a true coelom is:

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

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