[Build Advice] Model Anaerobic/Aerboic Breathing?

[Anthony]

Originally Posted by Ashtagon

I'm confused on this point too. Afaik, the only natural organic reaction that produces O2 and consumes CO2 is photosynthesis, found in plants (which incidentally also do the O2->CO2 reaction at the same time, but in different areas). I'm not seeing anything that implies these creatures are photsynthesising.

The original post mentioned acetogenesis, which consumes H2 and CO2, though based on this I think both are intermediate steps in the process, not feedstock. In any case, such a metabolism would be (a) very slow, and (b) almost certainly poisoned by oxygen.