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Simple diffusion means...

Simple diffusion means_______

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**Step-by-Step Text Solution:** 1. **Definition of Simple Diffusion**: Simple diffusion is a process that involves the movement of particles from an area of higher concentration to an area of lower concentration. 2. **No Membrane Requirement**: In simple diffusion, there is no need for a biological membrane to facilitate the movement of particles. This distinguishes it from other forms of transport that may require a membrane. 3. **Direction of Movement**: The movement of substances during simple diffusion occurs downhill, meaning it naturally flows from areas where they are more concentrated to areas where they are less concentrated. 4. **No Facilitators Needed**: Simple diffusion does not require any facilitators or transport proteins to assist in the movement of particles. It is a passive process. 5. **Example of Simple Diffusion**: A common example of simple diffusion is when perfume is sprayed in one corner of a room. The fragrance molecules move from the area of high concentration (where the perfume was sprayed) to areas of lower concentration throughout the room, illustrating how simple diffusion works. **Final Answer**: Simple diffusion means the movement of particles from an area of high concentration to an area of low concentration without the need for a membrane or any facilitators. ---
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