After the discovery of anaerobic life Pasteur understood the actual reason behind fermentation i.e. why the microorganisms carrying out the chemical changes in the organic infusions. Until then this was a mystery. The discovery of anaerobic life just made it possible for him to understand the basis of these chemical changes. The reason is the need of energy to sustain life. And the microorganisms were making the chemical changes to derive energy from the organic infusions either by aerobic or via anaerobic oxidation. In that way they were performing the process similar to respiration in higher organisms.
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