2006-12-13 05:32:46 · 6 answers · asked by sbs20278 1 in Science & Mathematics ➔ Biology
In the very first stages of life, every fetus starts out as a female. Males become males only with the addition of greater amounts of testosterone, which suppresses the development of female sex organs. Strong evidence for that fact can be found about a quarter of the way down a man's chest, his nipples. Nearly all mammalian embryos have mammary tissue from the beginning in preparation for future motherhood.
2006-12-13 06:39:02 · answer #1 · answered by Ash 3 · 0⤊ 0⤋
We all have all the same parts. The only differentiation is in the levels of the hormones testosterone and estrogen. Higher testosterone makes testes instead of ovaries in the embryo; penis instead of vagina.
2006-12-13 13:47:19 · answer #2 · answered by lowflyer1 5 · 0⤊ 0⤋
I think it's so they have yet another useless toy to play with.lol
2006-12-13 13:56:42 · answer #3 · answered by ginarene71 5 · 0⤊ 0⤋
So they have something to practice on.
2006-12-13 14:31:31 · answer #4 · answered by Anonymous · 0⤊ 0⤋
I agree w/ gina..
2006-12-13 14:11:26 · answer #5 · answered by Anonymous · 0⤊ 0⤋
why not?
2006-12-13 13:41:14 · answer #6 · answered by sunshine 5 · 0⤊ 0⤋