Answer:
Simple diffusion
Step-by-step explanation:
When the small and nonpolar molecules move from the region of their higher concentration to that of their lower concentration, the process is called simple diffusion. It is a passive process. This means that it does not require the input of energy to transport the substances. During simple diffusion, substances move along the concentration gradient to equalize their distribution. Diffusion does not require a living system and is exhibited both inside and outside the living beings.