|Orangutang at DC zoo|
“What’s the 4% of our DNA that Makes Us Different from Chimps?”, from Sci-Show (11 min), July 7, 2021.
He talks about HARS, or human accelerated regions. This has a lot to do with gene regulation as well as the biochemistry of the genes or amino acid replacement themselves. It seems as though language and intelligence started giving pro-humans reproductive advantages rather decisively
Humans are more fully bipedal than chimps which gives them real advantages in making tools. Bipedalism was an enormous biological innovation.