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What transformed the spinal cord in vertebratesanimals.​

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Answer:

AMPHIBIANS, reptiles, mammals, and birds EVOLVED after fish. The FIRST amphibians evolved from a lobe-finned fish ancestor about 365 million years ago. They were the first vertebrates to LIVE on LAND, but they had to return to water to reproduce. ... Mammals and birds both evolved from reptile-like ancestors

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