why we breathe oxygen and not something like carbon dioxide or nitrogen?
In: 40
When the first bacteria started producing oxygen as a byproduct of photosynthesis and thus causing the mass extinction of anaerobic organisms. Our ancestors were the ones to utilise this waste product as an energy source. The carbon dioxide they produced was then quickly utilised by the photosynthesisers giving a feedback loop and a kick start to new options for predator/prey and environmental utilisation.
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