State the main difference between primary and secondary succession. Give one example of each .

Explanation

### Step-by-Step Solution:

1. **Define Succession**: Succession is the process by which the structure of a biological community evolves over time. It involves changes in species composition and community structure in response to environmental changes.

2. **Identify Types of Succession**: There are two main types of succession: primary succession and secondary succession.

3. **Explain Primary Succession**:
- **Site of Occurrence**: Primary succession occurs in areas that are biologically sterile, meaning there is no existing soil or living matter. Examples include bare rock surfaces, volcanic islands, or newly formed sand dunes.
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