https://biology.stackexchange.com/questions/54762/did-cyanobacteria-commit-evolutionary-suicide-by-producing-oxygen
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Relevant story involving killing aliens with oxygen https://en.m.wikipedia.org/wiki/C-Chute
Making new food chain: fluorine-oxidizer lifeforms > oxygen-oxidizer lifeforms > nitrogen-oxidizer lifeforms > BN based lifeforms > silicon based lifeforms > germanium lifeforms
Pretty sure there's some worms or something that live by deep sea vents which breathe sulfur not oxygen and are believed to live forever because of this.
There's a bunch of creatures that don't use oxygen but they're mostly all prokaryotes, since oxygen metabolism unlocks a shitload of energy you can use for being large and complex.
