Question

give suitable biological reasons for diffusion is a passive process​

Answer 1

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Diffusion is a passive process of transport. A single substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across a space.

Answer 2

Diffusion is a passive process of transport. ... Diffusion expends no energy. Rather the different concentrations of materials in different areas are a form of potential energy, and diffusion is the dissipation of that potential energy as materials move down their concentration gradients, from high to low.