Why Do Men and Women Have Different Sounding Voices?

There is an organ called the larynx in a person's neck, and inside the larynx there is a pair of vocal cords which produces vocal sounds. When boys and girls are small, the length of their vocal cords is about the same. When boys are in their pre- and early teens, their Adam's apple grows bigger and their vocal cords grow longer. So their voices gradually become husky. Girls' vocal cords, however, do not change much, remaining shorter and narrower, so the sounds produced by their vocal cords remain high and sharp. But each person, no matter whether male or female, has vocal cords which differ from those of other people. So that's why we have tenors, baritones, basses and sopranos, mezzo-sopranos and altos.