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Paleontological Evidences

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Mention any one striking similarity that is found in the embryos of all vertebrates at an early stage. What is it indicative of?

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Solution

The embryos of all vertebrates at an early stage show more or less the same structure. Embryos of all vertebrates develop notochord and gill-clefts. Notochord is partly or fully replaced by vertebral column in the adults of all vertebrates. This similarity in embryonic development indicates evolution of vertebrates from a common ancestor.

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