Diffusion refers to the force of attraction between the particles of the same substance the force of attraction between the particles of two different substances the random movement of one substance through another separation of one substance from another based on differences in density

The correct option is ' random movement of one substance through another'.

Explanation:

Diffusion is defined as movement of the particles from area having higher concentration to the area having lower concentration. It is usually observed  in gases and liquids.

For example: Drop of ink in water

a. they are both space stations

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b) nuclear ive learned that in a pedtrodic table