How are the pulmonary arteries and veins different from the arteries and veins of the rest of the body, in terms of the kind of blood they carry?

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.