Stomach at Work! Materials transparent plastic bag spoon 500 ml of water bread or any biscuits calamansi juice Procedures: 1. Slice the biscuits or bread into small pieces and place them inside the plastic bag 2. Pour 500ml of water into the plastic bag. Tie the opening of the plastic bag. 3. Gently squeeze the plastic bag. Observe what happens. 4. Untie the plastic bag and add two tablespoons of calamansi juice to the mixture Inside the bag. 5. Gently squeeze the plastic bag again for a few minutes. Observe what happens. Answer the following questions. 1. Which material in the activity represented the stomach? 2. What happened to the biscuits and the bread when you squeezed the plastic bag? 3. What happened when calamansi juice was added to the mixture and then you squeezed the plastic bag? 4. What is represented by the mixture of water, calamansi juice, and pieces of bread or biscuits? 5. Why does the stomach need to soften the food that we eat? 6. What do you call the action done by the stomach to turn the food into soluble materials? 7. What have you learned from the activity?