1 - The people living in Africa at the time of mitochondrial Eve were not the same as the people who live in Africa today. In terms of race, they were probably unlike any race that currently inhabits the earth because they had not experienced the conditions or amount of time that caused humans into very distinct races.    2 - Human races evolved into different branches because the different areas they inhabited demanded specializing certain characteristics for survival. Europeans and Asians have evolved to live in an environment opposite of that in Sub-Saharan Africa, and likewise, Africans had even more time to become specialized to their environment.    3 - Out-of-Africa is still a theory, eg. it's not proven to be a fact