Originally posted by aryaputhra
what if the present day 'homo sapiens' are in fact a mixture of the neanderthals, homo floresiensis etc.
The timeline's all wrong, for one thing. Homo sapiens coexisted with the neanderthals and as best we can tell (DNA/RNA evidence, etc, etc) the
direct ancestor ofhomo sapiens is homo erectus.
Would that explain why we have different races? e.g.
No. If that was true, each race would be a different species. And they aren't. In fact, the range of human skin tones is so great that it overlaps
by 30-40% for every race around.
It does, however, have to do with your ability to survive at that latitude and under those climactic conditions. For example, I have extremely pale
skin (in spite of my American Indian ancestors). If you stuck me in Africa, I would die of skin damage much earlier than (say) my grandmother with
her much darker skin. People with her skin coloring (or darker) would do well in the tropics but only in rain forests. In the veldt/savannah/etc
only those with the darkest skin could survive the effects of the sun in a fairly unprotected environment.
At the northern latitudes, these dark-skinned people wouldn't be able to convert sunlight to vitamin D (something we do naturally in our bodies) and
would suffer boneproblems and other health problems and die rather quickly. With their long, lean body shapes, they couldn't conserve heat well and
would tend to suffer from the effects of the cold much more quickly.