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http://humanorigins.si.edu/evidence/human-fossils/species/ardipithecus-ramidus
http://australianmuseum.net.au/Orrorin-tugenensis
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http://humanorigins.si.edu/evidence/human-fossils/species/ardipithecus-kadabba
http://humanorigins.si.edu/evidence/human-fossils/species/ardipithecus-ramidus
http://australianmuseum.net.au/Orrorin-tugenensis
http://humanorigins.si.edu/evidence/human-fossils/species/orrorin-tugenensis
http://www.gorillas-world.com/gorilla-evolution/
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http://tolweb.org/treehouses/?treehouse_id=4438
http://www.termwiki.com/EN:postcanine_teeth
http://www.talkorigins.org/faqs/homs/a_piths.html
http://australianmuseum.net.au/Homo-habilis/
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http://humanorigins.si.edu/evidence/human-fossils/species/homo-heidelbergensis