Everything involves a penis and vagina... im just curious what everyone thinks about how this came to be. If everything was to banch off and evolve in there own separate way, why is it that the way everything reproduces is pretty much exactly the same?
2007-12-20 08:51:24 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Mammals all had a common ancestor; the common characteristics of all mammals are inherited from this common ancestor. Things like warm blood, a four-chambered heart, live birth, and reproduction via a penis/vagina were all presumably present in this ancestor. (Compare: why do all the members of the Smith family have red hair? Because Old Great Grandpappy Smith had red hair, and passed it on to his kids). Some mammal might eventually go off in a different direction, but so far this really hasn't happened.
Other organisms have a different strategy - many (like birds and reptiles) use a cloacal vent (combination anus/reproductive tract). Be glad you're a mammal.
2007-12-20 09:04:23 · answer #1 · answered by astazangasta 5 · 0⤊ 0⤋
Things evolve out of necessity. The 'two-party' male-female system is effective and therefore, hasn't changed.
2007-12-20 17:04:10 · answer #2 · answered by Itsa Secret 4 · 0⤊ 0⤋
Me and you baby aint nothing but mamals, so lets do it like they do on the discovery channel.... hehehe!!!
2007-12-20 16:55:35 · answer #3 · answered by Ro 2 · 0⤊ 0⤋
It evolved once in reptiles, and since then there has been no advantage to change it, so it hasn't changed.
2007-12-20 16:57:44 · answer #4 · answered by Weise Ente 7 · 3⤊ 0⤋
Me and you aren't nothin' but mammals so lets do like they do on the Discovery Channel...
2007-12-20 16:54:45 · answer #5 · answered by ? 3 · 0⤊ 0⤋
doggy style, thats the way i like it lol
2007-12-20 16:54:13 · answer #6 · answered by jd bunnyboy 2 · 0⤊ 0⤋
Good question.
2007-12-20 16:55:07 · answer #7 · answered by jmariamarie 1 · 0⤊ 0⤋
If it works don't change it.
2007-12-20 16:54:49 · answer #8 · answered by don_sv_az 7 · 2⤊ 0⤋