Hyla has

Options

A. tail
B. tympanum
C. 2 - chambered heart
D. gills

Answer

To solve the question regarding what Hyla has, we will analyze the options provided: tail, tympanum, two-chambered heart, and gills.

### Step-by-Step Solution:

1. **Identify what Hyla is**:
- Hyla is a genus of tree frogs, which are known for their ability to climb trees. They belong to the family Hylidae.

2. **Examine the characteristics of Hyla**:
- Tree frogs like Hyla have long hind legs and smooth, moist skin, which are adaptations for climbing.

3. **Analyze the options**:
- **Tail**: Adult Hyla do not have a tail. They lose their tail during metamorphosis from tadpole to adult.
- **Tympanum**: Hyla possess a tympanum, which is an external ear structure that aids in hearing. This is a characteristic feature of these frogs.
- **Two-chambered heart**: Hyla, like most amphibians, have a three-chambered heart, not a two-chambered heart.
- **Gills**: While tadpoles of Hyla have gills, adult Hyla do not possess gills as they breathe air through lungs.

4. **Conclusion**:
- Based on the analysis, the correct answer is that Hyla has a tympanum.

### Final Answer:
Hyla has a tympanum.