The Importance of Oxygen

Oxygen’s Gift. ‘A grand plot point in the history of life was the center-stage entry of oxygen into the atmosphere roughly 2.2 billion years ago. At the time, oxygen was a waste gas that emanated from the bacterial innovators of photosynthesis and posed mortal hazards to the anaerobic life that had been evolving for more than a billion years. With oxygen’s arrival, the choices for the planet’s microbial masses were to die, hide from oxygen, or evolve ways to live with it.’

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