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GENERAL KNOWLEDGE ™ 💡 GENERAL KNOWLEDGE ™ 💡 @general_knowledgetm · 69K subscribers
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A massive surge of photosynthetic cyanobacteria (blue-green algae) flooded the atmosphere with oxygen. This event—known as the
Great Oxidation Event—eventually created the planet's ozone layer, which filters out the sun's dangerous ultraviolet cosmic radiation and allowed life on land to evolve.

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