The fossil record shows that the jawed fishes called ____, which diversified in the Devonian and Carboniferous periods but left no direct descendants, had heads covered with large, heavy, bony plates and jaws with sharp cutting edges.

Question

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Placoderms were the jawed fishes known for their distinctive heavy, bony plates covering their heads and sharp-edged jaws. They flourished during the Devonian and Carboniferous periods but have no direct descendants today.

The Fossil Record Shows That the Jawed Fishes Called ____