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I don't get the concept at all. Earth's atmosphere didn't "become breathable". Rather, species evolved to survive within whatever the environment was at the t

I don't get the concept at all. Earth's atmosphere didn't "become breathable". Rather, species evolved to survive within whatever the environment was at the time and also had an effect on the atmosphere itself, thereby killing other species in a very complicated dance. The whole notion implied by the title is wrong.

phkahler 3y ago
Yeah, all those animals flopping around gasping for air until finally the air became breathable... ;-)
- chasil 3y ago
  It was actually prokaryotes that were dying in their own waste.