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From an evolutionary standpoint, is logical to expect to find selective pressures responsible for the appearance...

From an evolutionary standpoint, is logical to expect to find selective pressures responsible for the appearance of bipedality . Bipedality marks the emergence of our evolutionary line. What are the selective pressures that you find more likely (the multiple hypotheses ) hypotheses for the emergence of bipedalism in our ancestors . Why ?
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Bipedalism is a terresterial locomotion in which an organism moves on two limbs or legs.

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