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For a process known as diffusion, presence of a barrier is must.

Cell wall allows the movement of substances by a process known as osmosis.

All substances move across the cell membrane only by diffusion

The process of diffusion does not require a barrier such as cell wall and cell membrane.

answer is D.

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Detailed Solution

Diffusion of substances does not require any barrier and also takes place through a barrier such as cell wall (diffusion of ions or solutes and water). Lipid soluble substances move through the cell membrane by diffusion.

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