Write the names of biodegradable polymers.

Explanation

### Step-by-Step Text Solution:

1. **Definition of Biodegradable Polymers**:
- Biodegradable polymers are materials that can be broken down by microorganisms into natural substances like water, carbon dioxide, and biomass. This process occurs in the environment, making these polymers eco-friendly.

2. **Examples of Biodegradable Polymers**:
- **PHBV (Polyhydroxybutyrate-co-valerate)**: This is a copolymer that is produced by certain bacteria and is known for its biodegradability.
- **Dextran**: A polysaccharide that is produced by certain bacteria and is used in various medical and food applications.
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