Which statement correctly describes an interaction of the respiratory and

circulatory systems?

A. Carbon dioxide travels from the heart to the lungs in the

pulmonary arteries.

B. Carbon dioxide travels from the heart to the lungs in the

pulmonary veins.

C. Carbon dioxide flows with the blood from the lungs to the legs.

D. Carbon dioxide flows with the blood from the trachea to the lungs.

Dr. arenas is a scientist who has been trying to determine if increasing pressure will increase the sound that occurs when two chemicals explode. it measures the volume of the sound that occurs at the minimum pressure at which the explosion will occur. it then increases the pressure and measures the volume of the explosions that occur. what kind of investigation is the scientist conducting?