HELP INDEX NEXT UP PREVIOUS FEEDBACK ATG Evolutionary History
It is believed that the basic anatomical pattern of the backbone was first developed in fishes about 400 million years ago (Devonian period). It was to follow that amphibians and reptiles were to evolve from fish, as the fins became limbs and the gills became lungs. Theory continues that mammals developed from reptiles 60 to 70 million years ago (beginning of the Cenozoic era). [BM] {EB}
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