what is the difference between man and woman.
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Answer:
"Sexual dimorphism" is the scientific term for physical differences between males and females of a species. Many extreme examples exist: Peacocks far outclass peahens, for instance, while female anglerfish both outsize and outwit their tiny, rudimentary, parasitic male counterparts.
Unlike those animals, men and women are more physically similar than we are different. Nonetheless, there are a few key distinctions in our physiques. Some of them are designed to suit each sex for the role it plays in reproduction, while others exist to help us tell each other apart and to aid in our mutual attraction.
Women are the only primates who are busty all the time, even when they aren't nursing. Alternative theories exist, but most scientists think breasts are an evolutionary trick for snagging men; though they're actually filled with fat, not milk, they signal a woman's bountiful ability to feed her children.
Men and women both have cartilage surrounding their voice boxes, but because men have bigger boxes (which give them deeper voices), their chunks of cartilage protrude more. This gives them neck lumps called Adam's apples.
But why do men have deeper voices than women? The answer is that the pitch of a man's voice correlates with the amount of the male sex hormone testosterone he has, and his testosterone level is itself indicative of his genetic quality and sexual fitness. Because women have evolved to seek out men who have all the indicators of fitness and health, studies have shown time and time again that women tend to be more attracted to men with lower-pitched voices. They're looking for a mate with whom to produce healthy offspring.