Evolution of jaws first occurred in the group of fishes known as the

Name: Evolution of jaws first occurred in the group of fishes known as the
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Jaws evolved in the gnathostomes, or jawed vertebrates, which include all modern fish, as well as tetrapods (including humans). The other options either lack jaws altogether (such as ostracoderms) or possess jaws but are not ancestral to all jawed vertebrates (such as cartilaginous fishes, coelacanths, and ray-finned fishes).

Evolution of Jaws First Occurred in the Group of Fishes