The fossil record shows that the jawed fishes called ____ diversified in the Devonian and

Carboniferous periods, but they left no direct descendants. Their heads were covered with large, heavy
plates of bone, and their jaws had sharp cutting edges.



a. acanthodians
b. conodonts
c. osteolepiforms
d. placoderms
e. ostracoderms


D

Biology & Microbiology

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