frog is

Options

A. Ammonotelic
B. Ureotelic
C. Uricotelic
D. none of the above.

Answer

### Step-by-Step Solution:

1. **Understanding the Types of Nitrogenous Waste:**
- Organisms excrete nitrogenous waste in different forms based on their habitat and physiology. The three main types are:
- **Ammonotelic:** Organisms that excrete ammonia (e.g., aquatic animals).
- **Ureotelic:** Organisms that excrete urea (e.g., mammals, amphibians like frogs).
- **Uricotelic:** Organisms that excrete uric acid (e.g., reptiles, birds).

2. **Identifying the Excretory Product of Frogs:**
- Frogs primarily live on land and their main nitrogenous waste is urea. This is because urea is less toxic than ammonia, making it a suitable excretory product for terrestrial life.

3. **Considering the Life Stage of Frogs:**
- It is important to note that while adult frogs are ureotelic, their larvae (tadpoles) are ammonotelic because they live in water and can afford to excrete ammonia directly.

4. **Conclusion:**
- Based on the information about the excretory products and the habitat of frogs, we conclude that frogs are classified as ureotelic organisms. Therefore, the correct answer to the question is "ureotelic".

5. **Final Answer:**
- The correct option is **ureotelic**.