Diffusion and osmosis

Explanation

### Step-by-Step Text Solution

**Step 1: Definition of Diffusion and Osmosis**
- **Diffusion** is the process by which molecules spread from an area of high concentration to an area of low concentration until they are evenly distributed. It can occur in solids, liquids, and gases.
- **Osmosis** is a specific type of diffusion that refers to the movement of water molecules through a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

**Step 2: Medium of Occurrence**
- **Diffusion** occurs in all mediums: solid, liquid, and gas.
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