Explain why cotton is known as natural fibre.

Explanation

### Step-by-Step Solution:

1. **Definition of Natural Fiber**:
- Natural fibers are materials that are derived from natural sources, specifically from plants or animals. They are not man-made or synthetic.

2. **Source of Cotton**:
- Cotton is a type of fiber that is obtained from the cotton plant. The fibers are harvested from the seed pods of the plant, which are known as bolls.

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