how was the skin colour of different races driven by evolution?
earliest sapiens (current humans) started from Africa .. Africa has ample amount of sunlight and given we never wore a lot of clothes (or had sunscreen) to protect ourselves from sun we needed melanin .. its a natural skin pigment which protects skin from UV radiation and hence cancer .. so we in Africa produced a lot of melanin to survive .. then when the sapiens moved to north in Europe the exposure to sun was much lower which lowered the need of melanin giving them a fairer skins over tens of thousands of years .. then the same europeans moved to south america via north america the melanin went up again giving them back the darker skin colour ..
earliest sapiens (current humans) started from Africa .. Africa has ample amount of sunlight and given we never wore a lot of clothes (or had sunscreen) to protect ourselves from sun we needed melanin .. its a natural skin pigment which protects skin from UV radiation and hence cancer .. so we in Africa produced a lot of melanin to survive .. then when the sapiens moved to north in Europe the exposure to sun was much lower which lowered the need of melanin giving them a fairer skins over tens of thousands of years .. then the same europeans moved to south america via north america the melanin went up again giving them back the darker skin colour ..
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