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The arrows in the diagrams represent the direction of movement of a certain type of molecules through the cell membrane of two different cells. The dots represent the relative concentrations of these molecules. Which processes are illustrated in the diagrams?

a

Cell A shows phagocytosis and Cell B shows diffusion

b

Cell A shows pinocytosis and Cell B shows osmosis

c

Cell A shows active transport and Cell B shows diffusion

d

Cell A shows dehydration synthesis and Cell B shows the circulation