Diffusion of a substance across a cell membrane is an example of active transport.

Name: Diffusion of a substance across a cell membrane is an example of active transport.
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Diffusion is an example of passive transport, as it does not require input of energy from the cell. Active transport, on the other hand, requires energy to move substances across the cell membrane against their concentration gradient.

Diffusion of a Substance Across a Cell Membrane Is an Example