When diffusion has been happening across a membrane, eventually the number of particles on either side of the membrane is ____. Individual particles are still ____ across the membrane, but the ____ number are moving from left to right as are moving from right to left. In other words, there is no ____ movement in one ____ or the other. The system is in equilibrium – and if we want more diffusion to happen we need to ____ the concentration levels again.

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