List the names of the substances that are components of cell wall.

Explanation

### Step-by-Step Solution:

1. **Understanding the Cell Wall**: The cell wall is a rigid outer layer found in plants, some bacteria, and fungi. It provides structural support and protection to the cell.

2. **Identifying Components**: The main components of the cell wall include:
- **Cellulose**: This is the primary structural component of the plant cell wall, making up about 35% of its composition.
- **Hemicellulose**: This component accounts for approximately 15% of the cell wall. It helps bind cellulose fibers together.
- **Pectin**: Comprising about 40% of the cell wall, pectin is crucial for cell adhesion and provides flexibility.
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