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9-28-11 - Can see farther distances Avoid becoming prey see...

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Early Bipeds Primate Ancestor: Sahel Region of Djurab desert; South African area Fossil named Toumai Nearly complete skull, jaw fragments, teeth Mixture of chimp and human 6-7 mya Lived in mixed habitat of savanna, forest, rivers, and lakes. Demonstrates the first evidence of humans, but isn’t a human; shows movement toward what would become humans. Miocene Fossil Evidence Orrorin tugenensis East Africa 6 mya Skeletal fragments Roughly the size and build of a chimp We have no way of classifying these fragments and their relationship to humans or human ancestors Ardipithecus ramidus 1 st find in 1994 Dated 4.4 mya ; 17 people found this set of bones Skull, facial bones, teeth, upper limb bones 2 nd find in 2001 Dated 5.2-5.8 mya Jawbones, hand/foot bones, arm bones, and collar bones New habitat: these creatures lived in a cool, wet, forested environment Bipedalism Walking upright on two legs
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Unformatted text preview: Can see farther distances Avoid becoming prey; see food from farther off, less time searching Allows for freedom to use arms Carry stuff around; go out and bring things back; Reduces exposure to the sun Prevents diseases; keeps you cool; bolsters efficiency Anatomy of Bipedalism Skull Formal magnum Vertebrae Pelvis Forms a shelf for organs Legs Knees Ankles Feet Big Toe Australopathicus Anamensis 4.2mys; Kenya; 78 fragments Direct ancestor of ardipithecus ramidus Skull, jawbone, teeth, long bones Seems to point to the possibility that there is a whole other line of species of humans. Australopithecus: Afarensis 3-3.8mya Found in Tanzania and Ethiopia; lived in the Savannah Large canines and large grinding teeth Probably looked like a large chimp; looked very apelike Evidence of bipedalism. Very sexually dimorphic...
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