Neanderthal and Cro Magnon people developed separately
Explanation:
The Neanderthal people had developed out of an earlier displacement of people from Africa who had settle din Europe during the ice age and had developed their bodies for the cold climate there.
The Cro magnon people are in a way the precursor to modern humans developed later. They had bigger cranium sizes, more slender noses and were tall and thin compared to the neanderthals who were short and stout.