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If they are aerobic, where did they get oxygen from, before cyanobacteria themselves filled the atmosphere with oxygen as a waste product of photosynthesis?
If they are anaerobic, then how can they use energy efficiently? Glycolysis alone gives little energy, and they don't have the Krebs cycle and the Electron transport chain. Do they use some other method?
If they are anaerobic, then how can they use energy efficiently? Glycolysis alone gives little energy, and they don't have the Krebs cycle and the Electron transport chain. Do they use some other method?