Define self sustainability 

Explanation

### Step-by-Step Solution:

1. **Understanding the Term "Self":**
- The term "self" refers to something that is done independently or by itself without external assistance.

2. **Defining Sustainability:**
- Sustainability generally refers to the ability to maintain or continue a process over time. In the context of ecosystems, it involves the capacity of an ecosystem to endure and thrive without external inputs.

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