Protochordates lack_____.

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Cranium & vertebral column.

Jaws & vertebral column.

Paired appendages

All of the above

answer is D.

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Detailed Solution

An unofficial group of creatures is known as protochordates (i.e., not a proper taxonomic group). Animals in this category have some chordate traits, but not all of them. They lack a vertebral column and paired appendages but do contain pharyngeal gill openings and a dorsal nerve cord.

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