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Oct 312 Human Evolution.pdf

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Dan Syrotuik

Oct 3/12: Human Evolution October-03-12 7:47 AM ???Ardipithecus Ramidus (5.8-4.4mya)??? (Ardipithecus Kadabba: 5.8-5.5?) - Splitter or Lumper - Bipedal? - Small Canines - Teeth size proportions between apes and hominins - Lived in forested environment - Social Organization ○ Lived in monogomous pairs (based on a set of foot prints found) - this is just a guess as no concrete evidence has been found for this. - For the 3 earliest species, there is no concrete connection that explains how they are connected Missing Link: a fossil that will allow us to make a connection to others The Australopithecines (4.5-1.9mya) - Australopithecus: Anamensis (4.5-4 mya) - A. Afarensis (4.3-3 mya) - A. africanus (3-2.4 mya) - first discovered in the 1920's (called the "Mighty") - A. garhi (ca. 2.5 mya) - A. sediba (1.9mya) Australopithecine Characteristics - Small brain size (350cc to 450cc) - compared to body size, this is only about 1/3 of modern human brain size ○ Brain size compared to body size isn't changing that much - Increase in body size (1.0 to 1.5m) - could be used to explain why brain size is increasing ○ Live in a mosaic environment which includes both grassland and forests - Red
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