That is what evolution is. The constant mixture of genes from generation to generation that is occasionally altered by mutations.

The mixture of genes caused differences between members of the same species. It is extraordinarily rare for a single mutation to cause a new species, but new species are caused when enough mutations and differences between two groups of the same species occur that the two groups can no longer interbreed and produce fertile offspring.


Anyways, back to the subject at hand, it is quite literally impossible to point to one single being and label it the first modern human. The variations from generation to generation and from mutation to mutation are to miniscule to really measure these things. And that "face" that they claim is what this "Adam" looked like is absolutely bullcrap.