Earths biosphere was originally anerobic,, the evolution of photosynthesis pretty much wiped out all life that existed at the time (though it was all bacteria at that point).
adjective
Living or occurring in the absence of free oxygen.
"anaerobic bacteria."
Of or relating to anaerobes.
Not requiring air or oxygen for life; -- applied especially to those microbes to which free oxygen is unnecessary; anaërobiotic; -- opposed to aërobic
One time I used the word "twat" around my girlfriend and she said "you're pronouncing that wrong - it's pronounced twah." WTF? Turns out she thought when people used the word twat they were actually trying to use the French word toit. Why she thought people were trying to call other people roofs, I have no idea.
Blow her mind again by teaching her that despite the word existing and having the same meaning in both the US and the UK, in the former it rhymes with cot, but in the latter, cat.
I enjoy how "species who destroyed the planet and all living things" has become so normalized that it's just mentioned in passing before the actual punch line...