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In Experiment 1, why did the iodine move through the membrane of the diffusion bag but the starch did not? ) The iodine concentration inside the diffusion bag was higher than the starch concentration in the beaker, allowing iodine to diffuse out. ) Only one substance can diffuse through the membrane at a time, and the experiment did not allow time for the starch molecules to diffuse. ) Water fiowing out of the bag by osmosis washed iodine molecules out into the beaker and kept starch from moving into the bag against the flow. ) Iodine molecules are small enough to fit through the pores in the membrane, but starch molecules are too large to fit through the pores