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  • Published: 29 Mar 2022
  • 13 Pages, 3339 Words
Early Bipeds

Early Bipeds The First Hominin Radiation Radiations? Adaptive Radiation There were multiple forms that occurred through our 7 million year evolution Represent 3 Adaptive Radiations 1) Bipedality 2) Savanna 3) Cognition Fragmented fossil record Farther back in time=>fewer fossils Still many questions regarding the first bipeds Radiation 1: Early Bipeds Sahelanthropus tchadensis Sa - hail - anth - ro - pus Chad - en - sis ~7 - 6 mya Potassium/Ar...

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  • Published: 29 Mar 2022
  • 10 Pages, 2697 Words
The Australopithecus

Australopithecus Pt. 1 Savanna adaptations and the Genus Australopithecus Mio - Pliocene Climate shift The earliest bipeds emerged at the tail end of the Miocene (~23 - 5 mya ) and beginning of the Pliocene (~5 - 2.5 mya ) epochs This period, between 7 and 4 million years ago, is notable not only for the forms that appear but for the distinct change in climate associated with them Starting at around 12 million years ago, the earth cycled into a cooling trend Onset of g...

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  • Published: 29 Mar 2022
  • 10 Pages, 2550 Words
Gracile Australopithecines

Australopithecus Pt. 2 Radiation 2 Radiation 2 marked by slow bipedalism, with efficient energetic balance while foraging at low velocity Inefficient at higher speeds (i.e. running) Very successful Survived for 2 million+ years Not an intermediate stage at the time What lead to their success? Hard to tell Use of hands? Tools and Weapons Some believe Au. afarensis to be a tool user Plausible Chimpanzees use tools Cranial capacity for each between 450 -...

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  • Published: 29 Mar 2022
  • 13 Pages, 3344 Words
Genus Homo

Genus Homo Pt. 2 Radiation 3 Homo habilis ~2.3 - 1.5 mya Tanzania Overlap with many Australopiths Encephalization jump 510 - 630 cc Gracile skull Reduced dentition Finding Homo H. habilis might be controversial but still represents the start of a change Somewhere around 2.5 mya: Stone tools appear Gracile austalopithecines disappear - ish New gracile forms emerge with a larger cranial capacity Radiation 3 Homo rudolfensis N. Kenya 1...

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