Diffusion moves molecules from a ___ concentration to a ____ concentration.

Diffusion is a fundamental biological process that refers to the movement of molecules from an area of higher concentration to an area of lower concentration. This movement occurs due to the random motion of particles and continues until there is an equal distribution of molecules throughout the available space.

When molecules are in a high concentration, they are crowded together, and the likelihood of collision between them is greater. As a result, they will naturally move toward areas where their concentration is lower in order to reach equilibrium. This process does not require energy input, making it a passive transport mechanism vital for many biological functions, such as the exchange of gases in the lungs or the absorption of nutrients in cells.

Understanding this principle of diffusion is key to comprehending various cellular processes and the overall functionality of biological systems.