A 1/1,000,000 species per year extinction rate,which is the estimated continuous rate of extinction in the Earth's history,is called ____ extinction.

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The 1/1,000,000 species per year extinction rate is commonly referred to as the "background" extinction rate, which is the normal, continuous rate of extinction that occurs even in the absence of major disasters or human activity.

A 1/1,000,000 Species Per Year Extinction Rate,which Is the Estimated