Which one of the following structures is pres | vedclass

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(B) In all adult vertebrates,the notochord is replaced by a bony or cartilaginous vertebral column.In adult vertebrates,the dorsal tubular nerve cord

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Dorsal tubular nerve cord

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(B) In all adult vertebrates,the notochord is replaced by a bony or cartilaginous vertebral column.In adult vertebrates,the dorsal tubular nerve cord is modified into the central nervous system (brain and spinal cord).Pharyngeal gill slits are present during the embryonic stage in all vertebrates,but they typically disappear in terrestrial adults. While they persist in some fishes and amphibians,they are not universal in all adult vertebrates.However,all vertebrates possess a central nervous system derived from the dorsal tubular nerve cord,making it the most fundamental structure shared among them,though the question implies a structural feature common to the phylum Chordata that persists in the adult form. Given the standard interpretation of chordate characteristics,the dorsal tubular nerve cord (as the $CNS$) is the correct anatomical feature present in all adult vertebrates.

Which one of the following structures is present in all adult vertebrates?

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