
File name: species-climate-milestone-chart-620.png
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This graph shows milestones in human evolution correlated with climate variability. Milestones indicated along the bottom of the graph show hominin origins; habitual bipedality; first stone toolmaking, eating meat/marrow from large animals; onset of long-endurance mobility; onset of rapid brain enlargement; and expansion of symbolic expression, innovation, and cultural diversity. Adapted from Smithsonian Institution.