Climate Change Helped Drive Homo sapiens' Cousins Extinct

Climate Change Helped Drive Homo sapiens' Cousins Extinct
AP Photo/Martin Meissner

The branch on the tree of life that is the genus Homo is a gnarled, twisty one with many offshoots and dead ends. Of at least six species who have walked the Earth within the past few million years, all but one have gone extinct, for reasons that are largely a mystery.

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