What is a biodegradable polymer ? Give an example of a biodegradable aliphatic polyester.

Explanation

### Step-by-Step Solution:

1. **Definition of Biodegradable Polymer**:
A biodegradable polymer is a type of polymer that can be broken down by biological processes, such as the action of microorganisms (like bacteria) or environmental factors (like sunlight and moisture). These polymers decompose into natural substances, minimizing environmental impact.

2. **Characteristics of Biodegradable Polymers**:
- They can be decomposed by biological agents.
- They reduce pollution and waste in the environment.
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