Great Oxygenation Event (2.4 billion years ago) β #9 in Top 10 Worst Extinction Events in History | Top10Grid
#9
Great Oxygenation Event (2.4 billion years ago)
When cyanobacteria began producing oxygen, they poisoned the anaerobic organisms that dominated early Earth, causing perhaps the largest proportional extinction ever in what scientists call the "Oxygen Catastrophe."
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