Do diffusion and osmosis require energy? explain ! ?

Neither do.beacuse diffusion occurs due the random movement a substance's  particals move from a higher concentration to a lower concentration down the concentration gradient.On  the other hand osmosis  is the movement of water molecules from a high water potential to a low water potential through a partially permeable  membrane.thus no energy is required for them to do so.Active transport is a process that requires energy.

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