skin. lungs. kidneys. large intestine.
I gave my students this multiple choice question: Food is digested to the molecular level, absorbed, and then carried to the cells. The dissolved waste molecules produced by the cells are removed primarily from the blood by the

Only one answer is correct among these 4 choices:
- skin.
- lungs.
- kidneys.
- large intestine.

Could you tell me which one is correct?

kidneys.