By which method is water absorbed by the small intestine and the colon?

A) Osmosis
B) Diffusion
C) Filtration
D) Active transport

Osmosis involves movement of water across a semipermeable membrane,from a more dilute to a more concentrated solution.Absorption of water in the alimentary canal is an example of osmosis.Another example is reabsorption of tissue fluid into the venule ends of the blood capillaries.Diffusion is a passive process by which molecules of a solute move through a cell membrane; this does not fit the described situation.Filtration is movement of water and smaller particles from an area of high pressure (the left ventricle)to one of low pressure (the right ventricle).Active transport occurs when molecules move across cell membranes against a concentration gradient requiring the expenditure of energy.This does not describe the scenario in the question.