Which of the following group of animals have monocondylar skull :-

Options

A. Amphibia & mammals
B. Reptilia & mammals
C. Aves & mammals
D. Reptilia & aves

Answer

To determine which group of animals has a monocondylar skull, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Monocondylar Skull**:
- A monocondylar skull has only one occipital condyle, which is the joint that connects the skull to the vertebral column.

2. **Analyze the Options**:
- **Option 1: Amphibia and Reptiles**:
- Amphibians typically have a dicondylar skull (two occipital condyles). Reptiles also have a dicondylar skull.
- **Conclusion**: This option is incorrect.

- **Option 2: Reptilia and Mammals**:
- Reptiles have a monocondylar skull, but mammals have a dicondylar skull.
- **Conclusion**: This option is incorrect.

- **Option 3: Apes and Mammals**:
- Apes have a monocondylar skull, but mammals have a dicondylar skull.
- **Conclusion**: This option is incorrect.

- **Option 4: Reptiles and Apes**:
- Reptiles have a monocondylar skull, and apes also have a monocondylar skull.
- **Conclusion**: This option is correct.

3. **Final Answer**:
- The correct answer is **Option 4: Reptiles and Apes**.