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Answer:
Diffusion is the movement of a substance from an area of high concentration to an area of lower concentration . Diffusion occurs in liquids and gases when their particles collide randomly and spread out. Diffusion is an important process for living things - it is how substances move in and out of cells.
Step-by-step explanation:
i got 12 iq
spread of people, things, ideas, cultural practices, disease, technology, weather, and other factors from place to place.