27. Organize the items listed into the proper sequence of ev…
27. Organize the items listed into the proper sequence of events for gas exchange. a: O2 is transported to cells by the circulatory system. b: O2 is drawn into the lungs during inhalation. c: Cells use O2 and generate CO2. d: CO2 is exhaled. e: The circulatory system transports CO2 to the lungs.