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This concept is known as diffusion.  Diffusion is a passive process, as it requires no energy for it to occur.  In a cell, it is used as a method of passive transport since it requires no energy.

Answer:

Diffusion

Explanation:

Diffusion is a process by which a substance or certain molecule moves from a region of high concentration to a region of low concentration due to the concentration gradient and continues till the concentration become uniform.  

This is a passive mode of transportation.  

For example – Nutrients move across the cell membrane through a lipid bilayer of a cell membrane by the process of diffusion

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