Labels:bulletin board OCR: Such errors would contribute to a gradual genetic drift that seems to occur in all populations And a few errors would have been favorable to the survival of the species These would have been chosen by Darwinian natural selection The process of biological evolution was very slow at first it took two and a half billion years to evolve from the earliest cells to multi-cell animals, and another billion years to evolve through fish and reptiles to mammals But then evolution seemed to have speeded up
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