They really have no explanation. Some will honestly admit this. Some will dishonestly yammer about how it all happens at random. Some will offer it as fact.
For sexes to come to be, requires two significant sets mutations in two different animals, relatively unrelated, at the same point, which are compatible yet completely different, and the mutation must halt on both pair at the same time, and they find each other, and their significant mutations doesn't interfere.
They love to trivialize just how insanely difficult and unlikely that would be - even over billions of years. And the mutation rate would have to be significant for such things to have even an outside chance over billions of years and then abruptly stop after it happens.
We find no evidence of any of this (they pretend otherwise), but of course it's exactly how it's done with absurdly certainty. :eyeroll:
> For sexes to come to be, requires two significant sets mutations in two different animals, relatively unrelated, at the same point, which are compatible yet completely different, and the mutation must halt on both pair at the same time, and they find each other, and their significant mutations doesn't interfere.
Thank you, I think this was really well stated!
A lot of creatures are capable of switching their sex when they need to. So no you dont need "two significant sets mutations in two different animals" Fish seem to be the first creatures capable of sexual reproduction and to this day many of them can pretty much change sex at will. Id imagine the start of sexual reproduction happened along gender lines that were blurred to begin with.
That happens because they have genetics which allowed for it are already in place. See square one.
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