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Question: not sure what the correct answer is and an explanation...

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V 28. The appearance of a true jaw that likely evolved from the skeletal support of pharyngeal slits first occurs in the a. Craniates b Gnathostomes c. Chordates. d. Vertebrates. e. Amniotes.

Not sure what the correct answer is and an explanation to go along with it would be very nice! Thank you!

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