They know how the heart and lungs work together to keep oxygen supplied to the body.
In your body, the heart and lungs work together to make sure that oxygen gets to all the other organs of your body.
oxygen<>gets<>to all the other organs of your body$$$the heart and lungs<>work together<>to make sure<>In your body$$$the heart and lungs<>work together to make<>sure that oxygen gets to all the other organs of your body