What is critical piece of information in thefossil record

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Question: Dolphins have a single blow-hole on the top of their heads, whereas very early fossils of whale ancestors seemto show a normal two-nostril nose on the front of the snout. What is one critical piece of information in thefossil record that supports the idea that blow holes gradually evolved to the top of the cranium in dolphins?

Reference no: EM133505647

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