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Illustration of ancient single-cell organisms on a rocky surface, with gaseous trails and timeline text.

Illustration of ancient single-cell organisms on a rocky surface, with gaseous trails and timeline text.
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​The mass oxygenation of the atmosphere 600 MYA resulted in the rapid buildup of free oxygen. The oxygen levels fluctuated but had little direct effect on life, with mass extinctions not observed until the appearance of complex life around the start of the Cambrian period, about 550 million years ago. See more

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