How did vertebrates first evolve jaws?

Scientists reveal clues about the evolutionary origin of jaws by studying the embryonic development of zebrafish — an approach known as ‘evo-devo.’ Using imaging and cell tracing techniques in zebrafish, researchers who conducted the study conclusively showed that the pseudobranch originates from the same mandibular arch that gives rise to the jaw.Scientists reveal clues about the evolutionary origin of jaws by studying the embryonic development of zebrafish — an approach known as ‘evo-devo.’ Using imaging and cell tracing techniques in zebrafish, researchers who conducted the study conclusively showed that the pseudobranch originates from the same mandibular arch that gives rise to the jaw.

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