Biology · Nutrition

The ileum, which is part of the small intestine, is involved in the absorption of digested food. While duodenum and jejunum are involved in the digestion of undigested food that comes from the stomach. About 95 percent of nutrient molecules are absorbed in the small intestine.

The large intestine is involved in absorbing water, electrolytes, producing and absorbing vitamins, and forming and propelling feces towards the rectum for elimination. So, it is incorrect.

The ileum, which is part of the small intestine, is involved in the absorption of digested food. The duodenum and jejunum are involved in the digestion of undigested food that comes from the stomach. About 95 percent of nutrient molecules are absorbed in the small intestine. So, it is the correct option.

Your kidneys remove wastes and extra fluid from your body. Your kidneys also remove acid produced by your body's cells and maintain a healthy balance of water, salts, and minerals—such as sodium, calcium, phosphorus, and potassium—in your blood. So, it is incorrect.

The duodenum is involved in the digestion of undigested food that comes from the stomach. So, it is incorrect.