Name any fossil animal which serves as connecting link. Which two groups does it connect ?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a fossil animal that acts as a connecting link between two groups of animals.

2. **Defining a Connecting Link**: A connecting link is a fossil or species that exhibits traits of two distinct groups, providing evidence of evolutionary transition.

3. **Identifying a Fossil Animal**: One well-known fossil that serves as a connecting link is *Archaeopteryx*.

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