Here's my conclusion:
A species evolves in a slightly more developed state. It breeds with the species slightly beneath it and from which it evolved. They produce a more evolved (that is an offspring which is slightly more evolved than the ape but not quite as evolved as the more evolved parent). Interbreeding continues with older less evolved species dying off and the newer hybrids continuing to breed and moving the whole basket of what are now hybrids up the evolutionary ladder.Because the least evolved females continue to bear more evolved offspring and they die, the whole mixed/hybrid tribe(s) keeps moving up over time.
No humans yet...
Get the picture?
“Here’s my conclusion:
A species evolves ...”
I didn’t think you were an evolutionist. My bad.