Final answer:
The movement of Kool-Aid in water during the diffusion and osmosis experiment is caused by the concentration gradient.
Step-by-step explanation:
Osmosis is the process by which water moves from an area of high concentration to an area of low concentration. In the diffusion and osmosis experiment, the movement of Kool-Aid in the water is caused by the concentration gradient. The Kool-Aid particles are more concentrated in the area where the Kool-Aid has been added, so they move to the area of lower concentration in the water.