What does a museum preserve?

Explanation

**Step-by-Step Solution:**

1. **Definition of a Museum**: A museum is an institution that collects, conserves, and displays objects of artistic, cultural, historical, or scientific significance.

2. **Biological Museums**: Specifically, biological museums are dedicated to preserving biological specimens. These are often found in educational institutions like colleges and schools.

3. **Purpose of Preservation**: The primary purpose of preserving specimens in a biological museum is for reference and educational purposes. They serve as important resources for research and learning.

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