Petrochemicals include many things, I would say All of the above. Hope this helped! :)
Oxygen and carbon dioxide travels to and from tiny air sacs in the lungs, through the walls of the capillaries, into the blood. Blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs.
Your answer is D, Rhizobium
Baroreceptors. These are found in the carotids and aortic arch. They respond to pressure exerted on the vessels.
