500
There are three cause and effect words in this passage. 1. Researchers have learned that laughing can be good for you. 2. Laughing relaxes the facial muscles, causing you to look and feel less tense. 3. It also increases the oxygen in the brain, resulting in a light-headed sense of well-being. 4. In addition, laughing is a proven stress-reducer; it therefore decreases your chances of getting stress-related illnesses.
What are causing, resulting, and therefore?