This is a unit of study for those students who need to be challenged. The students are able to work independently and with each other on more advanced assignments, while you work with the class on the core information. You may use this for students who "pass" a pre-test, or for students who are high achievers. This unit is on Digestion and Respiration. Students must make tic-tac-toe to be sure they cover enough information AND cover the topics of both respiration and digestion. The weekly progress sheets and letter home to parents are also attached.