Answer:
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Passive diffusion is a form of passive transport and a type of diffusion by which particles from a high concentration gradient passes through a biological membrane to a low concentration gradient. Diffusion, or simple diffusion on the other hand, is the passage of molecules without the need of a membrane.
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the answer is B which is a crack in the topmost section of a glacier. I hope you got this right
speed = distance/ time
Sally's speed = 200m / 39 s = 5.13 ms^-1