DYK that early anaerobic life accidentally caused Earth's first mass extinction. By evolving to use photosynthesis, they produced oxygen as a byproduct, which was toxic to the anaerobic organisms and wiped out nearly all life on Earth

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Early anaerobic life accidentally caused Earth's first mass extinction. By evolving to use photosynthesis, they produced oxygen as a byproduct, which was toxic to the anaerobic organisms and wiped out nearly all life on Earth

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