Under that system, the brown haired, brown eyed, 5ft tall people of the world would think of themselves as a different life form than the blond haired, blue eyed, 6 ft tall people (again, just an illustration here).
You see this doesn't make sense, because a brown haired 5ft tall person can quite happily mate with a 6ft tall blond person and produce beautiful babies that have charachteristics of both. As can a tiny dog mate with a great dane, the offspring will still be a dog and only be able to mate with other dogs.
The fact someone with brown skin has evolved to the environment is one thing, they are not changing species. And if they mate with someone with white skin the children will get lighter again. Is this evolution? Or just as you get a particular type of pedigree dog by interbreeding, is it not more likely that two dark skinned people mated, and moved away and could survive in a hot land, and slowly the group got darker and more distinct features, If the dark skinned thing is true, what possible evolutionary benefit could it have been to have thicker lips? Or for oriental people to have slanted eyes?
And I SO understand the question about there being NOTHING in the world today that is between the species. They are distinct. If we have evolved and adapted to our environment, why are we all still living together doing our respective jobs? No doubt some of you will be shaking your heads and thinking how stupid that is, but to me, it's just common sense.
Thanks to Warlock and Dave for making this a really interesting discussion. I'm still on the fence, but have some better understanding.
Poppy