Which one is the most striking or common char | vedclass

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(A) The most fundamental and defining characteristic of the phylum $Chordata$,which includes vertebrates,is the presence of a $notochord$ at some stag

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Presence of notochord

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(A) The most fundamental and defining characteristic of the phylum $Chordata$,which includes vertebrates,is the presence of a $notochord$ at some stage of their life cycle.In vertebrates,the $notochord$ is replaced by a cartilaginous or bony vertebral column in the adult stage.While triploblastic condition,gill pouches,and coelom are also present in vertebrates,they are shared with many other invertebrate groups.Therefore,the presence of a $notochord$ is the most distinct and defining feature that separates vertebrates from other animal groups.

Which one is the most striking or common character of the vertebrates?

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