Over the past 500 million years, there have been ________ mass extinctions, and each time, at least ________ of the species on Earth became extinct.

Name: Over the past 500 million years, there have been ________ mass extinctions, and each time, at least ________ of the species on Earth became extinct.
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Scientists widely agree that there have been five mass extinctions in Earth's history, during which an estimated 50% or more of species were wiped out.

Over the Past 500 Million Years, There Have Been ________