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earliest_hominids[1] - Our first steps The earliest...

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1 Our first steps: The earliest hominids I. Transition from ape to human II. Early hominid characteristics III. The earliest hominids A. Ardipithecus ramidus B. Orrorin tugensis C. Sahelanthropus tchadensis IV. Australopithecus anamensis V. Australopithecus afarensis A. Hadar B. Laetoli C. Paleoenvironments VI. A. afarensis morphology A. Primitive characteristics B. Transitional characteristics VII. Hypotheses for the evolution of bipedality VIII. Other aspects of A. afarensis Evolutionary relationships among the hominoids Planet of the apes Miocene epoch, 23 - 5 mya > 60 species of apes The transition from ape to human • 10 mya : Orangutan-like hominoids in Asia ! 6 mya : Forests shrink. Hominids emerge. Do not differ from earlier hominoids, save for bipedality. 4 - 2 mya : Hominids diversify in East and South Africa. Early hominid characteristics 1. Bipedal 2. Wide dental arcade, thick tooth enamel, small canines, large molars Later hominid characteristics 1. Large brains 2. Slow development, prolonged infant dependence 3. Culture
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2 Early hominid characteristics 1. Bipedal 2. Wide dental arcade, thick tooth enamel,
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