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That's called a 'mass extinction' - a theory promoted by science to explain why there aren't many more animal species alive today.

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6y ago
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1mo ago

A brief period of time in which large numbers of species die out and disappear is known as a mass extinction event. These events have occurred five times in Earth's history, with the most well-known being the extinction of the dinosaurs at the end of the Cretaceous period.

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Q: What is a brief period of time in which large numbers of species die out and disappear?
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