Mitochondrial Eve and Y-Chromosome Adam lived thousands of years apart, they were not a couple.
The concept of Natural Selection, sometimes used synonymous with
"Survival of the Fittest, is often touted as the magic process that when added to mutation will result in advancing steps of higher and higher species and the success of evolution.
This is completely wrong, there are several "forces" operating as natural selectors, not only "survival of the fittest", in many species sexual selection by the females dictates the future of the specie.
In Evolution there's no "higher and higher species."
But it is never a process that will give you a new species.
This is pretty big claim and proof of this will give Nobel prizes, a place in History and a ton of money.