Compare the size of the egg with egg number 1. Put the egg back into a jar containing light corn syrup. Observe a week later, compare with eggs 1 and 3 and discard. Use your understanding of osmosis or diffusion to explain any changes you observed or didn't observe. Diffusion in a liquid is often illustrated by dropping a dye into a liquid and watching it spread out over a few minutes.
Real diffusion is actually much slower than that.
Most of the movement observed in water is caused by convection currents, not diffusion. To illustrate actual diffusion, place about a half a cup of light corn syrup in a glass. In a separate glass mix about a tablespoon of light corn syrup with a few drops of food coloring. With a dropper, carefully place a drop of the colored syrup on the top of the clear syrup. Cover the glass with plastic wrap and carefully place it on a shelf where it will be undisturbed.