Question

why should we walk upright​

Answer 1

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According to this theory, the energy saved by walking upright gave our ancient ancestors an evolutionary advantage over other apes by reducing the costs of foraging for food. The idea is just one of many scientists have entertained as reasons for why humans walk on two legs.

Answer 2

Answer:

The pelvis changed from being tall and flat from front to back to being much shorter and more bowl-shaped, giving better leverage for the muscles that move the hip in upright walking. The angle of the thigh bone changed to point inwards, bringing our feet more directly under the centre of our bodies.

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