Honestly curious

I wish there was a way to scientifically predict an accurate theory on what would happen if one gender suddenly vanished from the earth

Like do two scenarios (I know there’s more than one gender but for this post I’m just talking about M and F to keep it simple) (cisgender if you will)

But yeah do a theory on what would happen to men and the planet if women vanished from the earth forever and men were left to fend for themselves.

Then another theory on if men vanished from the earth and women had to fend for themselves

Honestly I know what I would expect to happen but that’s just me lmao

What would you expect to happen??