AP BIOLOGY

Detailed explanation-1: -Final answer: Diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration.

Detailed explanation-2: -Diffusion is defined as the net movement of molecules from an area of greater concentration to an area of lesser concentration. The molecules in a gas, a liquid or a solid are in constant motion due to their kinetic energy. Molecules are in constant movement and collide with each other.

Detailed explanation-3: -Diffusion is the net movement of molecules from an area where they are at a higher concentration to areas where they are at a lower concentration. This is due to the random movement of the molecules. The difference in the concentration of a substance between two areas is called the concentration gradient .

Detailed explanation-4: -Final answer: Movement of molecules from their higher concentration to their lower concentration is called diffusion.

Detailed explanation-5: -Diffusion is defined as the movement of individual molecules of a substance through a semipermeable barrier from an area of higher concentration to an area of lower concentration [34].