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The fundamental reason is that oxygen is not required. The ability to survive without oxygen affords a host of living accommodations such as soils, deep water, and skin pores.
In the absence of oxygen, glucose is not converted entirely to CO2 but to one or more two- or three-carbon compounds, and only in some cases to CO2. For instance, yeasts degrade glucose to two pyruvate molecules via glycolysis, generating a ...
The expert examines Pyruvate conversion products for anaerobic cellular respiration.