All processes of moving materials across the plasma membrane are classified as either
a) diffusion or osmosis
b) passive or active transport
c) phagocytosis or pinocytosis
d) endocytosis or exocytosis

The answer is A) diffusion or osmosis 
Diffusion is the movement of molecules from an area of low solute concentration to high solute concentration whereas osmosis is the movement of water from an area of high solute concentration to an area of low solute concentration until an equilibrium is reached. 

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