The main function is a. excrete wastes from the body in urine.
Answer:
Healthy vitamin D levels might help prevent skin from prematurely aging but too much sun leads to accelerated skin aging. Some studies have found that vitamin D can help treat skin conditions like dry skin, psoriasis, or eczema
Explanation:
If the blood is carrying oxygen, the cell and the blood will have a sort of trade. The cells will give the blood the waste which will leave the body and the blood will give the cell oxygen which it needs to stay alive and continue to work.
I think A, When you fast your body does not register that you have eaten that much, so when you eat faster you eat more. But when you eat slow your body registers that you have eaten that much making you eat less.