Introduction to Week 12

Welcome to week 12! Last week you learned about some of the mass extinctions that have occurred throughout the history of the Earth, and causes for those extinction events. You also learned how biodiversity helps ecosystems, and the threats to biodiversity.

This week is a review for your next test, just like the one in week 5. This review will cover weeks 6 - 11. Remember, you can go back to any page in previous weeks to review. If you have completed all the assignments from weeks 6 - 11, you will be much better prepared for the Unit 2 Test. Good luck!