Protochordates are not vertebrates as_____.

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Notochord absent.

Vertebral column absent.

Nerve cord absent.

None of the above.

answer is B.

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Detailed Solution

An unofficial group of creatures is known as protochordates. Another name for protochordates is Acrania. They are distinguished by lacking a vertebral column. The skull and cranium are absent from them. They don't have jaws, either. Hemichordate, Urochordate, and Cephalochordates are the subphyla and phylum that make up this group.

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