what is your evidence that lucy walked upright, lets start with that. Because I believe she was a knuckle walker.
The evidence is that Lucy's pelvis had more in common with modern humans than with any other ape. The short, broad pelvis and inward angled femurs are adaptations for walking upright. Lucy also had wrist adaptations for knucklewalking. It's almost as if Lucy's species was making a transition. . .
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