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I am guessing your downvoters have never heard of mass extinction events. EDIT: Here.... let me google up an example. https://en.wikipedia.org/wiki/Great_Oxyg

by splawn 9y ago

I am guessing your downvoters have never heard of mass extinction events. EDIT: Here.... let me google up an example. https://en.wikipedia.org/wiki/Great_Oxygenation_Event https://en.wikipedia.org/wiki/Great_Oxygenation_Event