CRITICAL THINKING IDENTIFYING THE CAUSAL HYPOTHESIS 1. Stress causes ulcers. 2. Certain bacteria in the lining of the stomach cause ulcers. 3. Pity caused him to give money to the homeless person. 4. Guilt caused Barbara to apologize to her friend. 5. The joke made David laugh. 6. Your snapping at me causes me to think that you are angry with me. 7. Talking over your problems with someone can help a person feel better. 8. An exercise of sufficient intensity and duration raises the level of endorphins. 9. Eating chocolate raises your serotonin levels. 10. Gravity causes the ball you throw to fall back to Earth. 11. Gravity is produced by physical forces. 12. The fracture in your teeth happened because you bit down too hard.