Differentiate between Simple diffusion and facilitated diffusion

Explanation

### Step-by-Step Solution:

1. **Definition of Simple Diffusion**:
- Simple diffusion is the movement of substances across a semi-permeable membrane or in a solution without the assistance of transport proteins. It occurs naturally and spontaneously due to concentration gradients.
- **Example**: Osmosis, which is the diffusion of water.

2. **Definition of Facilitated Diffusion**:
- Facilitated diffusion is also a passive transport process, but it involves the movement of molecules or ions across a semi-permeable membrane with the help of transport proteins. This process also occurs spontaneously and does not require energy.
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