How many mass extinctions have happened on earth?



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    Extinction may be a bit of a scary word, but it almost seems as though extinction is what all species are destined for. 99% of all species on Earth have met extinction. There have been several mass extinctions in the history of the world, but 5 have been categorized as the most extreme. We’re in the middle of the 6th, with the disappearance of amphibians over the last 50,000 years signaling the beginning of the 6th mass extinction.

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