Give one example of smallest and another of large sized ecosystem.

Explanation

### Step-by-Step Solution:

1. **Understanding Ecosystems**: An ecosystem is a community of living organisms (biotic components) interacting with their physical environment (abiotic components). This includes both plants and animals as well as non-living elements like soil, water, and climate.

2. **Identifying the Smallest Ecosystem**:
- One example of a small-sized ecosystem is an **aquarium**.
- An aquarium contains water, fish, plants, and microorganisms, all interacting in a confined space.

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