In diffusion, the concentration of substances moves from?

In diffusion, substances move from areas of high concentration to areas of low concentration. This process occurs because particles tend to spread out in order to achieve a balanced or uniform distribution, driven by the kinetic energy of the molecules. As molecules are in constant motion, they encounter each other and move from regions where they are more crowded (high concentration) to regions where they are less crowded (low concentration). This movement continues until equilibrium is reached, meaning that the concentration is equal throughout the given space. Understanding this fundamental principle is crucial in biology, as it explains how substances such as gases, nutrients, and waste products move across cell membranes, facilitating essential life processes. The other options suggest incorrect directions of movement or concepts that don't align with the natural tendency of particles to diffuse.