The genetic data suggest that between 813,000 and 930,00 years ago, the ancestors of modern humans experienced a severe "bottleneck," losing about 98.7% of its breeding population.
Our ancestors experienced such a severe population bottleneck for a really long time that they faced a high risk of extinction
The researchers estimated the modern human breeding population numbered about 1,280 for about 117,000 years.
severe cooling that resulted in the emergence of glaciers
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