Explanation:
Food and liquids are processed by the digestive system. After nutrients are absorbed during digestion, the excretory system removes solid waste products, or feces, through the rectum. The excretory system also works with the respiratory and circulatory systems and removes carbon dioxide (CO2) from the body.
I’d choose C but biology was a bit ago
C. and the explanation is i just know
4 because if you have a infection it causes you not to breath properly
