21. During a lab in her Biology class at Jamul High School, Romilda set up an experiment testing the effects of running on production of carbon dioxide. She decided to only use female students between the ages of 14 – 17. All of the female students also needed to weigh between 85 – 105 pounds and measure between 22% - 32% body fat. Half of the female students will not run, while the other half will run for 25 minutes every day for 30 days.