Lactose intolerance causes diarrhea because the reabsorption of water in the colon is decreased. This is because undigested lactose in the colon _______.
1) increases the amount of ATP required for the active transport of water
2) reduces the amount of ATP required for the active transport of water
3) increases the amount of lactase enzyme in the colon
4) reduces the amount of lactase enzyme in the colon
