No matter how hard I try not to react (get upset) on hearing people use the word "race" (in terms of human beings of course) I always find myself getting extremely annoyed 
and explaining how irrelevant the term is! I cannot believe that people divide us into groups by the colour of the skin! I always thought that it was obvious that we are all one species and the way we look has nothing to do with who we are. From a biological point of view, the differences in skin colours are simply results of adaptaion to various environments. Obviously, people living in for example African countries will have dark coloured skins due to the sun exposure - their skin will contain a lot of melanin so they are better protected against diseases such as skin cancer.
Pale Europeans would find it very hard to live in very hot, sunny countries without skin protection (sun lotions etc.) It's like with Eskimos for example, who have short limbs and stocky bodies so they can retain heat - they are adapted to their cold environment. In my opinion, "race" is a purely social concept, it has nothing to do with human biology. Under the skin, we are all Homo sapiens with the same organs... 
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