What are the functions of a cell wall?

Explanation

### Step-by-Step Solution:

1. **Definition of Cell Wall**:
- A cell wall is a non-living structure that surrounds the cell membrane in certain types of cells, such as plant cells, fungal cells, and bacterial cells. It is not present in all cells.

2. **Composition of Cell Wall**:
- The composition of the cell wall varies among different organisms:
- In plants, the cell wall is primarily made up of cellulose.
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