Scientists believe that the first terrestrial vertebrates – stegocephals descended from the ancient brush-headed fish. What data led to this conclusion?

1) in the carp-fish, muscles appeared on paired fins;
2) a similar arrangement of bones in the skeleton of the fins of the carp-fish and in the skeleton of the limb of stegocephalus;
3) cysterae fish, like stegocephals, breathe lightly.

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