Which group of vertebrates possessed an anatomical feature that made evolution of the limbs of all tetrapods possible?

Name: Which group of vertebrates possessed an anatomical feature that made evolution of the limbs of all tetrapods possible?
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Question

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Lobe-finned fish possessed an anatomical feature called the lobe fins, which contained bones similar to those found in the limbs of tetrapods. This allowed for the evolution and development of limbs in tetrapods.

Which Group of Vertebrates Possessed an Anatomical Feature That Made