One of the earliest great extinctions in Earth's history may have been caused not by an asteroid or a volcano but by oxygen itself, when tiny photosynthetic microbes slowly filled the air with a gas that was poison to much of the anaerobic life that ruled the planet - Space Daily
Source:Space Daily
Around 2.4 billion years ago, the air over Earth began to change. Microbes in the oceans, the cyanobacteria, had been running a chemical reaction that split water and released oxygen as waste. For a long time that oxygen was mopped up almost as fast as it was…
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