The circulatory system the body to remove waste when it carries oxygen to the muscles. carries carbon dioxide to the lungs. carries nutrients to the organs. carries hormones throughout the body.

I would say that there are two answers to this: The circulatory system helps the body to remove waste when it carries oxygen to the muscles and carries nutrients to the organs.  

"The human circulatory system is responsible for delivering food, oxygen, and other needed substances to all cells in all parts of the body while taking away waste products."

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Transfer of electrons. hope it !

Lexy is correct because angle r is between the incident wave,  n  = 0, and a diffracted wave.