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.
