Frog's ear has no

Options

A. Middle ear
B. Internal ear
C. Eustachain tube
D. External ear

Answer

**Step-by-Step Solution:**

1. **Identify the Organism**: The question pertains to the anatomy of a frog, which is classified under the class Amphibia.

2. **Understand Frog Anatomy**: Frogs have a unique ear structure compared to mammals. They possess a tympanum, which is an external structure that functions similarly to an eardrum.

3. **Recognize the Absence**: The key point in the question is identifying what is absent in a frog's ear. Frogs do not have an external ear structure known as the "pinna," which is present in many other animals, including humans.

4. **Function of the Tympanum**: The tympanum in frogs serves to receive sound waves, which then travel to the middle ear and are transmitted to the internal ear through the Eustachian tube.

5. **Conclusion**: Therefore, the correct answer to the question "Frog's ear has no" is that it has no external ear or pinna.

**Final Answer**: Frog's ear has no external ear (pinna).

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