Archaeopteryx is

Options

A. Extinct mammal
B. Extinct bird
C. Star fish
D. Marine fish

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks about the classification of Archaeopteryx.

2. **Evaluate the Options**: The options provided are:
- A) Extinct mammal
- B) Extinct bird
- C) Starfish
- D) Marine fish

3. **Analyze Archaeopteryx**:
- Archaeopteryx is known to be a prehistoric creature that exhibits characteristics of both birds and reptiles.
- It is recognized as one of the earliest known birds.

4. **Determine the Correct Classification**:
- Since Archaeopteryx is primarily classified as a bird and is extinct, the correct answer is **B) Extinct bird**.
- It is important to note that it does not fit the other categories: it is not a mammal, starfish, or marine fish.

5. **Highlight Unique Features**:
- Archaeopteryx has features of both reptiles (like teeth) and birds (like feathers and wings), making it a significant link in the evolutionary history of birds.

6. **Conclusion**:
- The answer to the question "Archaeopteryx is" is **B) an extinct bird**.

---