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If shes mixed with white and black then black
It's all dependent on which race you are. Women from Europe tend to have pink nipples, while those from Africa or Sout America have much darker nipples. There are, of course, always exceptions to the rule.
Nipples become darker when pregnant
Brown
No. They have different sized different for different sized nipples.
people can have different eye color because of the probalility that their parents have different eye color.
Some nipples are differnt mainly because the color is varied in other parts of the skin. There is no problem with it.
No, most people have nipples that are darker(if only slightly) than the skin. This doesn't mean anything is wrong with you though. My friend's nipples are like that. Don't ask how I now :)
Brown
Her nipples are BLUE
Her skin tone.
Not all red heads have big nipples. Just like people of all different colours, nipple shape can vary depending on the person.