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What kinds of natural causes lead to the extinction of a species?

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What kinds of natural causes lead to the extinction of a species?

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Extinction Extinction is the complete demise of a species. It takes place when all individuals of a species die out. Extinction has occurred throughout the history of life on Earth. It is the ultimate fate of all species. In fact, it has been estimated that 99.9% of all species that have ever lived on Earth are now extinct. The causes of extinction are many and highly variable. They vary from environmental changes brought about by events such as floods, volcanic eruptions, or meteorite impacts, to fluctuations in sea level or climate, to competition between species. In the past 25,000 years humans have become a significant additional cause of extinction for many species.

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