Page 134 - Science Course 3 (Book 2)

Mo11-L4: Key Concept Check

Direction: Answer each question on the lines provided.

1. What do all organisms depend on for survival?

2. What is a mass extinction?

3. What are two examples of environmental events that have caused mass extinctions?

4. How does volcanic activity cause climate change?

5. What happens to organisms that do not adapt to environmental changes?

6. What do scientists hypothesize contributed to the mass extinction of dinosaurs?

7. How many signif cant mass extinctions have occurred in Earth’s history?

8. What happened as Earth moved from the Permian to the Triassic period?

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