The circulatory system assists the functioning of the digestive system by transporting:

a. hydrochloric acid to the stomach.
b. bile to the duodenum.
c. hormones to the digestive system.
d. enzymes to the digestive system.

The influenza virus cause the flu, but not other diseases. why?

How does photosynthesis show the conservation of mass and energy?

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.