"TomHendricks474"  wrote in message
news:c2grrl$n70$1{at}darwin.ediacara.org...
> << The shift to bipedalism was, primarily, a
rock-throwing,
> stick-wielding adaptation. >>
>
>
> I think equally or even more important was the idea of
"carrying the baby" that
> bipedalism allowed.

Very true! Which also allowed greater nurturing and parental
investment in infants and adolescents, contributing to the
acceleration of cultural (social) evolution.
.....tonyC
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