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2.3 million years ago. The most important difference between Homo habilis and Australopithecus was a 50% increase in brain size. H. erectus evolved about 2 million years ago and was the first hominin species to leave Africa and disperse across Eurasia. Perhaps as early as 1.5 million years ago, but certainly by 400,000 years ago, hominins began to use fire for heat and

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