This is a PowerPoint assignment I created for my 7th grade science students to review the concepts of photosynthesis and cellular respiration. After an introduction to the concepts, students are assigned a PowerPoint presentation explaining the equations of photosynthesis and cellular respiration and then comparing/contrasting the processes. The assignment can be done by students individually or in pairs depending on time constraints and the abilities of your students. Students can also present their slides in front of the class for additional review. Also included is an extension activity to differentiate the lesson for advanced students or students who finish early.