Scientific Adam and Eve

[robvalue]

Speciation would be a particular point in time, yeah. But this Adam and Eve are not the points of speciation, they are the most recent common ancestor of all currently living humans, under two different rules. Which particular people are Adam and Eve is not fixed, but depends on who is still alive. If a whole bunch of people got wiped out, then they might both move "forward" to much more recent people.

Sometimes different species can reproduce, but the results are sterile. I don't know enough to say exactly why that is. So a mule is an offspring of a male donkey and female horse. They are different species so the result is sterile. It does sound like a "safety mechanism" of sorts. I've heard of Ligers too

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