Similarity between simple diffusion and facilitated diffusion is:

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Both do not use energy or ATP for transport of substances.

Both show uphill transport

Both require special membrane proteins

Both do not require the presence of concentration gradient

answer is A.

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Detailed Solution

Simple diffusion and facilitated diffusion require the presence of a concentration gradient and transport substances downhill.Simple diffusion does not require ATP and special membrane proteins.Facilitated diffusion does not require ATP but requires special membrane proteins for the transport of substances.

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