What mm is saying is that when the first sub-humans left Africa, they were still hairy and upright ape-like creatures. Homo-Erectus? I can\'t recall which. Anyway, by the time those beings spread all over Europe and all over Asia without too much contact from one another.
How could they evolve the same way? It\'s called evolutionary convergence. Think of how the Australian dingos are very similar to the wolves yet their species were never in contact.
The ape-like humans evolved into higher intelligent humans and also adopted to their environment. In the nortern lands where sun light was not as abundant, humans needed ligher skin to absorb more nutrients from the Sun. Those who stayed near the Equator evolved to have darker skin so it was protected from too much sun (that\'s why fair skinned people tan - excep the Irish, they freckle).