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nomadic groups whose food supply depends on hunting animals and gathering plant foods
agricultural revolution; far-reaching changes in human life resulting from the beginnings of farming
4-1 million BC, found in southern and eastern africa, brain size 500 cm3, 1st humanlike creature to walk upright
200,000-30,000 BC, found in europe and southwest asia, brain size 1,450 cm3, 1st to have ritual burials
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