Frogs

Options

A. Are uricotelic
B. Have olfactory lobes in midbrain
C. Do not have renal portal system
D. Have lymphatic system

Answer

To answer the question regarding frogs and their characteristics, we will analyze each statement provided in the options step by step.

### Step-by-Step Solution:

1. **Statement 1: Frogs are uricotelic.**
- Frogs excrete urea as their primary nitrogenous waste, which classifies them as ureotelic organisms. Uricotelic organisms, on the other hand, primarily excrete uric acid, which is typical for birds and reptiles. Therefore, this statement is **incorrect**.

2. **Statement 2: Frogs have olfactory lobes in the midbrain.**
- Frogs do possess olfactory lobes, but these are located in the forebrain, not the midbrain. The midbrain of frogs contains optic lobes, which are responsible for vision. Hence, this statement is also **incorrect**.

3. **Statement 3: Frogs don't have a renal portal system.**
- Frogs actually have a well-developed renal portal system. This system connects the liver and the lower parts of the body, facilitating the elimination of nitrogenous waste. Thus, this statement is **incorrect**.

4. **Statement 4: Frogs have a lymphatic system.**
- Frogs do have a lymphatic system, which includes lymph, lymph vessels, and lymph hearts. This system plays a crucial role in maintaining fluid balance and immune functions in the body. Therefore, this statement is **correct**.

### Conclusion:
The correct statement regarding frogs is that they **have a lymphatic system** (Option D).