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allegedly-insane t1_j1cgsrd wrote on December 23, 2022 at 7:19 AM

Reply to comment by jawshoeaw in Mars' ancient atmosphere may not have had much oxygen after all by pecika

Oxygen is extremely toxic. Both to humans and especially anaerobic life forms. Having the biochemistry to deal with low concentration of oxygen doesn't really mean much — it's like saying mercury isn't toxic if you have the biochemistry to deal with it.