" . . . Alternatively, it could come down to anatomy, and pig hearts may
not be up to the job in a human body. Our hearts have to work much
harder to fight gravity than a pig's because we walk on two legs rather
than four. . . "
https://www.bbc.com/news/health-60708120
" . . . Alternatively, it could come down to anatomy, and pig hearts may not be up to the job in a human body. Our hearts have to work much harder to fight gravity than a pig's because we walk on two legs rather than four. . . "
https://www.bbc.com/news/health-60708120
Early hominoids perhaps 20 Ma were already orthograde (upright,
vertical),
- but simply for wading bipedally & climbing arms overhead in
forest swamps & mangroves
If an animal can proceed quadrupedally
(as our ancestors before ~5 ma could)
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