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(C) The division Vertebrata is classified into two divisions based on the presence or absence of jaws:$1$. $X$ represents Agnatha,which are jawless ve

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Agnatha - Tetrapoda

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(C) The division Vertebrata is classified into two divisions based on the presence or absence of jaws:$1$. $X$ represents Agnatha,which are jawless vertebrates. The class Cyclostomata belongs to this division.$2$. The other division is Gnathostomata,which are jawed vertebrates. This is further divided into two superclasses: Pisces (bearing fins) and Tetrapoda (bearing limbs).Therefore,$X$ is Agnatha and $Y$ is Tetrapoda.

Column-$I$	Column-$II$
$(a)$ Contractile vacuole	$(i)$ Excretory unit
$(b)$ Parapodia	$(ii)$ Food ingestion
$(c)$ Flame cells	$(iii)$ Locomotion
$(d)$ Nematocysts	$(iv)$ Osmoregulation

Select the correct option for the labeled part $X$ and $Y$ from the given diagram.

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Match the following columns:
Column-$I$ Column-$II$
$(a)$ Contractile vacuole $(i)$ Excretory unit
$(b)$ Parapodia $(ii)$ Food ingestion
$(c)$ Flame cells $(iii)$ Locomotion
$(d)$ Nematocysts $(iv)$ Osmoregulation

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