Diffusion | Membranes and transport | Biology | Khan Academy

Understanding how particles passively diffuse down their concentration gradient. Watch the next lesson: ...

Answer

What is simple diffusion:

Simple diffusion is basically the diffusion of substances through a membrane without needing the help from other substances, such as proteins. An example would be carbon dioxide gas for plants. When the stomata open, it goes into the plant, as a result of moving from a higher concentration to a region of lower concentration.

Biology and What is simple diffusion

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