Over eons there were various methods of species splitting off. Smooth and abrupt due to various catastrophic inputs like the ‘great dying’ of 250 MYA (caused by the huge Siberian lava flow) and the dinosaur killer be it a Yucatán asteroid or Deccan Traps lava flow 66 million years ago. There is also some evuidence of various evolutionary change inputs caused by radiation from gamma ray burst stars from many light years away.
There is also some evuidence of various evolutionary change inputs caused by radiation from gamma ray burst stars from many light years away.
Then science should be able to duplicate these events again; in a small scale, of course.
That they have not done so leads me to wonder...