The most highly advanced character in crocodile is the presence of

Options

A. powerful jaws
B. shelled eggs
C. thecodont dentition
D. four chambered heart.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the most advanced characteristic of crocodiles among the given options: powerful jaws, shelled eggs, psychodont dentition, and four-chambered heart.

2. **Analyzing the Options**:
- **Powerful Jaws**: While crocodiles do have powerful jaws, this feature is not unique to them and is common among many reptiles.
- **Shelled Eggs**: Crocodiles lay eggs with shells, but this is also a characteristic shared with many other reptiles and birds.
- **Psychodont Dentition**: This refers to the type of teeth crocodiles have, which are adapted for their feeding habits. However, this is not considered the most advanced feature.
- **Four-Chambered Heart**: This is a significant feature that allows for the separation of oxygenated and deoxygenated blood, leading to a more efficient circulatory system.

3. **Identifying the Most Advanced Character**: The four-chambered heart is a unique and advanced characteristic that is primarily found in birds and mammals, making it a significant evolutionary trait. Crocodiles having a four-chambered heart places them in a more advanced category compared to other reptiles, which typically have a three-chambered heart.

4. **Conclusion**: Based on the analysis, the most advanced character in crocodiles is the presence of a four-chambered heart.

**Final Answer**: The most highly advanced character in crocodile is the presence of a four-chambered heart.

---