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I used this clip in my lesson plan for semi-permeable membranes as "motivation" for sparking interest in the subject. The main question: What happens to your fingertips when you've had them under the water for too long? Why? This can lead into conversation at the molecular level (i.e. osmosis).

This animation is simple to follow and has a great short quiz at the end. It shows how osmosis is different than diffusion and explains the different osmotic concentrations.

Effects of osmotic pressure on plant and animal cells. This is simple chart the sums it up pretty nicely. I chose this one because it shows that movement of water via green arrows.