What are some possible causes of mass extinctions, Biology

What are some possible causes of mass extinctions

Problem

Watch the short video: "The Permian Mass Extinction | NOVA scienceNOW".

1. How many major mass extinctions have occurred over Earth's history? (this was in lecture not the video)

2. What are some possible causes of mass extinctions?

3. What evolutionary process commonly takes place after a mass extinction event?

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Biology: What are some possible causes of mass extinctions

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