Water flows up a plant's stem against the force of gravity. In which of the following ways could the movement of water up a plant be modeled? A. Place a clear pipe in a small tub of water. Shake the tub back and forth. Watch how the water moves around the pipe. B. Place the tip of a sponge in water dyed with food coloring. Watch how the water moves up the sponge. C. Pour a glass of water on top of a towel that is spread out on a table. D. Blow through a clear straw in a glass of water. Observe the level of water inside the straw.