Lecture Notes - Bipedalism

Lecture Notes - Bipedalism - Making of the Modern World 1...

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Making of the Modern World 1: Prehistory and the Birth of Civilization Professor Scott L. Vandehey Fall 2008, Track D “Bipedalism” Oct. 3 rd , 2008 Questions of the day: 0. What is bipedalism? 1. How and when did human ancestors evolve into bipedal creatures? 2. What effects does bipedalism have? 3. Why are we bipedal? Bipedalism 0. Having two feet, and therefore walking upright Why us? 0. Apes can walk bipedally for short periods 1. Why us and not chimps or other apes? When? 2. Laetoli footprints 0. 3.5 million year ash 1. Tanzania 2. A. afarensis (Lucy) 3. Note big toe 3. Physiological changes 4. Legs, hips, and feet 5. Location of foramen magnum 6. 6 million years ago What the heck is a foramen magnum? The bipedal ape
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4. All hominid fossils exhibit some form of bipedal adaptation 5. May have been first development to set species apart 6. But why? The walking environment 0. Large forests giving away to pockets of wooded areas 1. Food resources become rarer 2. Distance between food greater 3.
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