Where is a nucleolus found ?

Explanation

**Step-by-Step Solution:**

1. **Identify the Location**: The nucleolus is found within the nucleus of eukaryotic cells.

2. **Understanding the Nucleus**: The nucleus is the central part of a eukaryotic cell, often referred to as the control center or brain of the cell. It contains the cell's genetic material.

3. **Nuclear Membrane**: The nucleus is surrounded by a nuclear membrane, which serves to protect the contents of the nucleus and regulate the passage of materials in and out.

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