A scientist designed an experiment to examine the effects of exercise on respiration. He collected the volume of the gases produced by a group of people as they were running, walking, and at rest for 5 minute time periods.
Which question can the scientist answer with his experiment?
Does the amount of time spent being active affect the volume of carbon dioxide breathed in?
Does decreased activity require a higher amount of oxygen than increased activity?
Does the amount of oxygen produced during physical activity depend on time?
Does increased activity lead to a higher volume of carbon dioxide produced?