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Actually, that is indeed very simple to explain. Men and women are mammals, a species that have breasts and feeds its young with milk. The human embryo has tissue that will evolve into breasts. Both male and female babies are born with nipples and ducts intact. It is the presence of genes that direct hormones to differentiate the breast tissue. The Y chromosome stimulates hormones such as testosterone to form male features. As most of ya know, everyone starts as a woman, it's only with certain …