Some individuals have a darker skin colour while others have a
lighter skin colour.
This colour difference is seen due to the presence of melanin
pigment in the skin produced by melanocytes.
Dark skin people have a higher level of melanin production as
compared to white skin people.
Exposure to UV radiation present in sunlight also causes skin
darkening. This is why people living in hot regions have a darker
skin tone. Other factors responsible for dark skin are heredity and
ethnicity.
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