Question

all people have some brown and some yellow pigments — their skin

Answer 1

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All people have some brown and some yellow pigments on their skin.

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Answer 2

Human skin color is quite variable around the world.  It ranges from a very dark brown among some Africans, Australian Aborigines, and Melanesians  to a near yellowish pink among some Northern Europeans.  There are no people who actually have true black, white, red, or yellow skin.  These are commonly usedcolor terms that do not reflect biological reality.

Some of the variation in human skin coloration(Sub-Saharan African, Indian, Southern European, and Northern European)

Skin color is due primarily to the presence of a pigment called melanin , which is controlled by at least 6 genes.  Both light and dark complexioned people have melanin.  However, two forms are produced--pheomelanin , which is red to yellow in color, and eumelanin , which is dark brown to black.  People with light complexioned skin mostly produce pheomelanin, while those with dark colored skin mostly produce eumelanin.  In addition, individuals differ in the number and size of melanin particles.