Final answer:
Water absorption in the small intestine is driven by the concentration gradient. About 90 percent of water is absorbed in the small intestine, with the remaining water being absorbed in the colon.
Step-by-step explanation:
About 90 percent of water is absorbed in the small intestine. The concentration of water is higher in chyme than it is in epithelial cells. Thus, water moves down its concentration gradient from the chyme into cells. Much of the remaining water is then absorbed in the colon.