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The Crackers & The Bread In A Bag Digestive System Demonstrations Part 1 of 2: Do you really want to show your students what digestion looks like? These hands-on demonstrations are extremely simple to do and show clearly what happens to food between the time it enters your mouth until it passes into your small intestine. They may forget many things but they will never forget the crackers & the bread in the bag demonstrations. JUST CLICK THE CRACKER.