Which form of cell transport allows small molecules to move from an area of higher concentration to an area of lower concentration without energy being required from the cell?
a. osmosis
b. pinocytosis
c. phagocytosis
d. simple diffusion

Osmosis is the movement of small molecules from an area of higher concentration to an area of lower concentration without energy being required from the cell. It only uses the difference in concentration of the surrounding molecule. The answer is letter A. It is not a simple diffusion because the statement above is in the form of cellular transport. It is not phagocytosis because phagocytosis is the process by which a protest or phagocyte engulfs a solid particle to form phagosome. It is not pinocytosis beacasue it is a form of cell drinking wherein small particles are brought into the cell and then suspended within the vesicle.