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Human evolution shows a series of well-defined trends reflecting structural, functional, and behavioral changes that distinguish modern humans from their primate ancestors. One of the most significant trends is the development of bipedal locomotion. Early hominins gradually shifted from arboreal life to upright walking, leading to modifications in the pelvis, vertebral column, femur, and foot. Bipedalism freed the forelimbs for manipulation and tool use, providing adaptive advantages ____ _____ _____ ______ ________ _____ __________ ______ ______ ____ ______ ______.
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