That Time Oxygen Almost Killed Everything

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What if we told you that there was a time when oxygen almost wiped out all life on Earth? 3 billion years ago, when the world was a place you’d never recognize, too much of a good thing almost ruined everything for everybody.

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References:
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http://www.bbc.com/news/science-envir...
https://www.sciencedaily.com/releases...
https://link.springer.com/referencewo...
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