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cosmiccoffee9 t1_j1bl6jr wrote

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

yes, "quasi-spacefaring Earth-based species" is a fairly narrow niche, fair enough.

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allegedly-insane t1_j1bvjuq wrote

It really is as far as we can tell. It's much more likely that anaerobic (glucose based, not oxygen) life exists than aerobic. Many reasons for this include it's easier (doesn't require a ton of oxygen), less dangerous environments (not exposed to open-air), and as far as we know is the precursor to aerobic life. Anaerobic organisms, before anti-bacterials, were extremely successful little survivors :)

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