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Does the process of diffusion transport with the concentration or against the concentration gradient?

Question

Does the process of diffusion transport with the concentration or against the concentration gradient? 

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Step 1

Diffusion is the process of movement of molecules across the membrane (membrane must allow the molecule to pass through it freely). Movement of molecules across the membrane can be active (requires energy) or passive (does not require energy).

Step 2

When a molecule diffuses through a membrane, it always moves from the region of higher concentration to lower concentration or can be explained as movement down the concen...

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Biology

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