Name one fossil animal which serves as a connecting link. Which two groups does it connects?

Explanation

**Step-by-Step Solution:**

1. **Identify the Fossil Animal**: The fossil animal that serves as a connecting link is the *Archaeopteryx*.

2. **Determine the Groups Connected**: The *Archaeopteryx* connects two groups: reptiles and birds.

3. **Explain the Characteristics**:
- The *Archaeopteryx* exhibits characteristics of both reptiles and birds.
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