Why do men have nipples?

Answer 1

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Okay...long story short.

Females, I believe are X chromosomes, and males are Y chromosomes.

When conceived, the male's sperm carries X and Y chromosomes to the egg, which are always X chromosomes.

If a sperm carrying an X chromosome (aka: Xx) to the egg conceives, the baby will be a girl. If a sperm carrying the Y chromosome conceives (Xy), the baby will be a boy.

Notice the consistency...all EGGS are female...so nipples are a given either way...it just depends upon the X or Y chromosome from the father on whether the hormones know to grow in the future, or stay flat in the future.

Hope this helps.

Answer 2

it only shows that they are also mammals.