Re: OT: Carbon Dioxide races -> known vs unknown -> terraforming mars -> is or is not
Anaerobic respiration (releasing energy from glucose and such without the use of oxygen) is too innefficient for it to work for complex organisms. It can only be used continuously for very simple single celled organisms. It is done in complex organisms such as humans as an extreme backup (such as during very heavy, prolonged excercise), but it is not effective for very long.
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