Answer:
Diffusion
Explanation:
Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. Diffusion happens in liquids and gases because their particles move randomly from place to place. Diffusion is an important process for living things; it is how substances move in and out of cells.
It can also be said to be net movement of anything from a region of higher concentration to a region of lower concentration. and it is being driven by a gradient in concentration.
