The characteristic possessed by our ancestors that enabled them to survive the dislocations wrought by the shrinking forest habitat at the end of the Miocene was their ability to:

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Walking on two feet allowed our ancestors to cover larger distances and move more efficiently through open savanna areas, which became more prevalent as the forests shrank. This also freed up their hands to carry and manipulate tools, which became essential for their survival. Brachiation, outthinking or outfighting their ape cousins were not as significant factors in their adaptation to the changing habitat.

The Characteristic Possessed by Our Ancestors That Enabled Them to Survive