Plănts: We will make our own food and output a poisonous gas, that way nobody will bother us.
Animals: Allow us to introduce ourselves.
See: Humans Are Space Orcs
Probably more like ‘slowly corroding’ from the inside.
At first I thought this was going to be about Scuba diving as the deaths caused by oxygen is a factor that needs considering.
Central Nervous System toxicity. Also, oxygen at over 160% starts to get deadly on its own.
See also: premature babies and adults with COPD. Oxygen toxicity is a thing.
When humans go out on space walks, they bring their death environment with them in bags.
Relevant story involving killing aliens with oxygen https://en.m.wikipedia.org/wiki/C-Chute
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.





