2. Have the students investigate into the activity of enzymes by performing experiments to determine how to slow down or speed up the work of enzymes. The lesson plan for this activity can be found at: http://pals.sri.com/tasks/9-12/Catalase/.
3. This clip can introduce a discussion of respiration, specifically an anaerobic respiration or fermentation. The class can discuss how respiration without oxygen occurs. The class can then split into groups and make root beer: http://www.teachers.net/lessons/posts/1229.html or make sauerkraut: http://wildfermentation.com/resources.php?page=sauerkraut after having discussed how these processes occur. This can then be related to the fermentation occurring in the gut, producing the uncomfortable gas distension.