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BAA outline 3 - Outline for Powerpoint 5 Why study fossils...

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Outline for Powerpoint 5 Why study fossils? o Help determine evolution of primate line o Can understand the forces of evolution o Can understand the process that led toward thinkers and tool makers Remains are usually only jaw and teeth 4 functional systems (in living animals that help understand fossils) o Locomotive o Feeding o Information & brains o Social behavior LOCOMOTION o Bipedal—use only 2 limbs—only primate that regularly uses this o Quadrupedal-use all 4 limbs (most nonhuman primates) o Brachiation-arm swinging, switching back and forth between arms— useful when feeding on branch tips—also precursor to bipedalism o Vertical clinging and leaping-all 4 limbs hold onto tree, leap from this position to another tree and resume clinging position—precursor to bipedalism Comparison between Quadrupedal and Bipedal o Orientation of muscles different (see picture on slide) o Angle of femur different (more angled for quadrupeds) o
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  • Fall '08
  • Glander
  • o Scapula, non-divergent big toe, Reduced lumbar region, larger pelvic bone, Hominoids Shared Characteristics

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