Markk wrote:... in which one celled future mammal did the penis and vagina evolve from?
WTF?
This guy is asked us to locate a particular unicellular species, presumably back in the period when there were only unicellular species, i.e. about 3 billion years ago, and identify which one was the ancestor of mammals.
The first mammals are thought to have appeared only about 200 million years ago - almost the day before yesterday in comparison with the preceding time gap (though it depends what you call a mammal ...).
I think I can absolutely guarantee that absolutely no observer, 3 billion years ago, would have had any way to tell which one-celled creature was to have descendants for whom the random breaks broke in a way that ended with with (some of) those descendants ending up as mammals.
Markk, even Marrk, has to know that.
I am currently hesitating between
(a) terminally dumb, or
(b) troll.