https://www.thestatesman.com/technology/study-explores-how-fluctuation-in-oxygen-levels-could-have-accelerated-evolution-of-life-1503121542.html
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10/15/22 at 6:22am
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The Statesman
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ANI
Fossilised traces of early animals - known as Ediacaran biota, multi-celled organisms that required oxygen - have been found in sedimentary rocks that are 541 to 635 million years old.
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