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5 key evolutionary transitions. Step 1: 'BIPEDALISM (~6 mya) - Walking upright on two legs. Freed the hands for tools and carrying. Australopithecus was bipedal but still had small brains. Evidence: footprints at Laetoli, Lucy's hip bone structure.' Step 2: 'TOOL USE (~2.6 mya) - Homo habilis ('hand
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