If Homosapiens survived the last mass extinction how is there almost 8 billions Humans now? Are we all related? Is every human related in some way?
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Many scientists think that roughly 50,000-100,000 years ago humanity was reduced to a population size of about 3,000-10,000 individuals due to the Mount Toba volcanic eruption. With such a small number of individuals humanity has extremely low genetic diversity (i.e. we are all very closely related to each other.)
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