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Adaptation. Earliest adaptations:BipedalitySlightly smaller canine teethDramatic expansion of the brain came millions of year laterAppearance of cultural traditions such as stone tool use probably was just a difference in degree at first, rather than kind, from the ape-human ancestorWalking upright is an extremely rare way to move aboutOnly among some dinosaurs (T. rex) and in hominids did bipedalism become a widespread adaptationOf >4,000 living mammals only humans are habitual bipeds to9442

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