What may be the reason for the difference in the colour of skin in people living various parts of the world ?
The primary reason for the difference in skin colour among people living in different parts of the world is the amount of melanin pigment present in the skin. Melanin is a natural pigment produced by the body that helps to protect the skin from the sun’s ultraviolet rays. People living in areas with higher levels of UV radiation tend to have darker skin tones, since their bodies produce more melanin to protect them from the sun. People living in areas with lower levels of UV radiation tend to have lighter skin tones, since their bodies produce less melanin.