happy70
They r black becoz they r more exposed to the sunlight. that is y thr skin tone is black in colour. ..
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sd202167KoushikDas
Because the region where they live are close to equator where the sunlight radiation is the most i.e. the places are most hot. And, black skin have a type of antibody that defends them from UV rays and they have evolved it from generations living in Africa.
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hope it helps uu