What Happens When Diffusion Moves Molecules Across the Plasma Membrane

What happens when diffusion moves molecules across the plasma membrane?

A) Most molecules are capable of crossing the phospholipid bilayer at any location and at basically the same rate.
B) Energy input is required to transport molecules.
C) The rate of diffusion cannot be influenced by the cell.
D) The cell gains needed materials and gets rid of excess materials very quickly.
E) The process is relatively slow and is driven by concentration gradients.

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