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

Dorsal tubular nerve cord

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Pharyngeal gill slits

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Notochord

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both a) and b)

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Solution

The correct option is A Dorsal tubular nerve cord
In adult vertebrate, notochord is replaced by bony or cartilaginous vertebral column. In adult vertebrate, nerve cord is represented by central nervous system. Pharyngeal gill slits occur during embryo stage in all vertebrates, but disappear in adults. However in some fishes and amphibians, gill slits occur in adults also.

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Name the phylum in which dorsal nerve tube, notochord and pharyngeal gill clefts are present.

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