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Fossil evidence from the past 4 million years suggests that

   

The expansion of woodland vegetation in Eastern Africa likely explains human migration out of the region

   

The transition from woodland to grasslands may have favored bipedalism in our early hominid ancestors

   

Human brain sizes increased through time, likely because of Milankovitch cycles and impacts on Earth s radiation budget

   

Early hominids were unable to migrate out of Africa until Eurasian glaciers retreated

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