When did human ancestors start walking on two legs?
Anthropologists have been arguing for 20 years about whether Sahelanthropus, a hominin that lived about 7 million years ago, was one of the first bipedal apes
Anthropologists have been arguing for 20 years about whether Sahelanthropus, a hominin that lived about 7 million years ago, was one of the first bipedal apes
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