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Lab 4 Diffusion and OsmosisBIO201LPost-Lab Questions”1. Why is it necessary to have positive and negative controls in this experiment?”It is important to show that the indicator reagent and the starch and glucose used arenot faulty.”2. Which substance(s) crossed the dialysis membrane? Support your response with3. Which molecules remained inside of the dialysis bag?4. Did all of the molecules diffuse out of the bag into the beaker? Why or why not? ”