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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Question

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There have been five mass extinctions over the past 500 million years, and during each of these events, around 50% of the species on Earth became extinct. Therefore, only option B is correct.

Over the Past 500 Million Years,there Have Been Mass Extinctions