How Evolving Traits Helped Humans Survive Unstable World

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How Evolving Traits Helped Humans Survive Unstable WorldThree different human species may have walked the Earth at the dawn of the human lineage, dividing up their environment in slightly different ways, and the ancestors of modern humans may have survived because oftraits such as large brains that helped them adapt to unstable, shifting landscapes, researchers say. Modern humans, Homo sapiens, are the only living members of the human lineage, the genus Homo, which is thought to have arisen in Africa more than 2 million years ago. Many now-extinct human species were thought to once roam the planet, such as Homo erectus, the first to regularly keep the tools it made. Many traits unique to the human lineage were long thought to have originated between 2.4 million and 1.8 million years ago in Africa.


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