Which of the following is present during some | vedclass

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(D) Animals belonging to the phylum $Chordata$ are fundamentally characterized by the presence of a $notochord$,a dorsal hollow nerve cord,and paired

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Notochord

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(D) Animals belonging to the phylum $Chordata$ are fundamentally characterized by the presence of a $notochord$,a dorsal hollow nerve cord,and paired pharyngeal gill slits at some stage of their life cycle.While the $notochord$ is replaced by the vertebral column in vertebrates,the defining feature that unites all chordates at some point in their development is the $notochord$.

Which of the following is present during some stage of the life cycle in animals belonging to the phylum $Chordata$?

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