Why the skin tone of people differ depends on the place they live?

or:Why the skin tone of people differ depends on the place they live?or:People living in areas that have a lot of sun with a warmer climate tend to b

or:Why the skin tone of people differ depends on the place they live?

or:People living in areas that have a lot of sun with a warmer climate tend to be darker. While people living in areas that are not so warm will have a lighter complexion.

or:Where the sun is strongest, skin colour has become darkest, while weak solar radiation gives light skin colour.Dark-skinned people need six times more sun than white-skinned people to get enough Vitamin D. On the other hand, they have less chance of developing skin cancer.

or:Most probably the skin tone varies depending on the amount of sun's radiation. Although it does not completely depend on the sun's radiation. It also varies depending on the gene and the food style.

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