Define ecosystem.

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Ecosystem**: An ecosystem is a community of living organisms (biotic components) interacting with their physical environment (abiotic components).

2. **Components of Ecosystem**:
- **Biotic Components**: These include all the living things such as plants, animals, fungi, and microorganisms.
- **Abiotic Components**: These include non-living elements such as water, air, soil, sunlight, and minerals.

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