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How does DNA analysis tie human evolution to the Toba eruption that occurred 74,000 years ago?

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The Toba eruption has been linked to a genetic bottleneck in human evolution about 70,000 years ago; it is hypothesized that the eruption resulted in a severe reduction in the size of the total human population due to the effects of the eruption on the global climate.
User Erick Sasse
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