What are the categories polymers into which can be classified based on the source?

Explanation

To classify polymers based on their source, we can categorize them into three main types:

### Step 1: Identify the Categories
Polymers can be classified into three categories based on their source:
1. **Natural Polymers**
2. **Synthetic Polymers**
3. **Semi-Synthetic Polymers**

### Step 2: Define Each Category
- **Natural Polymers**: These are polymers that occur naturally in the environment. Examples include proteins, cellulose, and natural rubber. They are derived from plants, animals, or microorganisms.

- **Synthetic Polymers**: These are man-made polymers that are created through chemical processes. Examples include plastics like polyethylene, polystyrene, and nylon. They are synthesized from petrochemicals or other raw materials.

- **Semi-Synthetic Polymers**: These polymers are derived from natural sources but have been chemically modified to enhance their properties. Examples include cellulose acetate and rayon, which are derived from cellulose but have undergone chemical processing.

### Step 3: Summarize the Classification
In summary, polymers can be classified based on their source into:
1. **Natural Polymers**: Naturally occurring.
2. **Synthetic Polymers**: Man-made.
3. **Semi-Synthetic Polymers**: A combination of natural and synthetic processes.