The major function of the respiratory system is to: A. give the heart the energy it needs to circulate blood.
B. cleanse the body of toxins, poisons, and harmful chemicals.
C. maintain the digestive system of the body so that it can continue to operate.
D. provide oxygen to the body and eliminate carbon dioxide from the body.

The scales shown in the introduction measure mass, or the amount of matter in a particular object. the scientific law of conservation of mass states that matter cannot be created or destroyed during a chemical reaction, but it can change from one form to another. did the simulation support this scientific law? explain why or why not.