List one major difference between primary wall and secondary cell wall.

Explanation

### Step-by-Step Solution:

1. **Understanding Cell Walls**:
- The cell wall is a non-living, rigid structure that surrounds the plasma membrane of plant cells. It provides support and protection to the cell.

2. **Identifying Primary Cell Wall**:
- The primary cell wall is the first layer formed during cell division. It is relatively thin and flexible, allowing for cell growth.
- Composition: The primary cell wall is primarily made up of cellulose and hemicellulose.
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