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Why do many of the transitional fossils fish and tetrapods have flat heads

User Kerbrose
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Answer: Many fish have flat heads. But what is significant in this case is that the earliest tetrapods that had been discovered (i.e., Acanthostega and Ichthyostega) had flat heads. So finding a flat-headed fish was a good indicator that this fossil was part of the gradual evolutionary sequence from fish to tetrapods.

User Mdarwi
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