The largest mass extinction event happened around 250 million years ago, when perhaps 95 percent of all species went extinct. There is even evidence to suggest that microbes may have sped up or contributed to some of the mass extinctions known throughout the Geologic Time Scale.

Though mass extinctions are deadly events, they open up the planet for new forms of life to emerge. Earth has witnessed five, when more than 75% of species disappeared. Mass extinctions—when at least half of all species die out in a relatively short time—have occurred only a handful of times over the course of our planet's history. Top Five Extinctions numerous volcanic eruptions), or even meteor strikes onto Earth’s surface. Time and time again, the reign of a species have fallen with an abrupt ending.

Earth has experienced 5 mass extinctions where more than 99% of species that existed are now extinct. The big five mass extinctions Biologists suspect we’re living through the sixth major mass extinction. There are several causes for mass extinctions, such as climate change, geologic catastrophes (e.g.

Mass extinctions are common in nature.

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