According to the fossil record, which of the following jawed fishes diversified in the Devonian and Carboniferous periods, but left no direct descendants?

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Placoderms diversified during the Devonian and Carboniferous periods, but became extinct at the end of the Devonian period, leaving no direct descendants. Ostracoderms are actually jawless fishes that existed before the evolution of jawed fishes, while osteolepiforms gave rise to tetrapods and conodonts are extinct eel-like animals that left behind tooth-like fossils.

According to the Fossil Record, Which of the Following Jawed