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Answer the following questions from the article:
1. What are the 5 major extinctions in Earth's history and what caused each?
2. What do scientists think will cause the 6th extinction? (list all)
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Write a summary in your notebook on p.51 about what this website shows you or informs you about. Why do you think it has 2 levels? Look at both levels and tell the difference. (Summary should be a minimum of 4 sentences).