homework due on 1/19

1. Take test for Module 8 (I will email it to you on Tuesday.)
2. Finish extra credit 8.1, optional (p. 241-2)
3. Read first part of Mod 9 p. 261-280 up to "The Cambrian Explosion"
4. Write out answers to the corresponding SG questions for Mod. 9 (p. 241-2)