Sometimes but it is mainly due to pigment, just as the same with pigmentation of the skin. It's interesting because chimpanzees, our closest biological relative, have pink gums.
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I do not know how "normal" they are but my niece has them. No one else in the family has them that I know of.
White people are not cooler than black people or anyone else & black people are not cooler than whites or anyone else. Everyone is the same; no better, no worse.
because they are black
Black people are not simply one whole of a people to be unjustly judged. Black people are individuals, and the decision on whether an individual can be trusted rests on the person whose trust is to be given.
How has barack obama improved the quality of living for black people?