In crocodilia, the teeth are

Options

A. Thecodant
B. Unequal
C. Not used for mastication
D. All the above

Answer

To answer the question "In crocodilia, the teeth are," we will analyze each of the provided options step by step.

### Step-by-Step Solution:

1. **Understanding the Term "Crocodilia":**
- Crocodilia refers to the order of reptiles that includes crocodiles, alligators, caimans, and gharials. These animals are known for their unique dental structure.

2. **Analyzing the First Option: "Thecodent":**
- The term "thecodent" means that the teeth are set in sockets within the jawbone. This is true for crocodilians, as their teeth are indeed thecodont.
- **Conclusion:** This option is correct.

3. **Analyzing the Second Option: "Unequal":**
- Crocodilian teeth are not uniform; they can vary in size and shape. This variation is due to the fact that crocodilians are polyphyodonts, meaning they can replace their teeth multiple times throughout their lives.
- **Conclusion:** This option is also correct.

4. **Analyzing the Third Option: "Not used for mastication":**
- Mastication refers to the process of chewing. Crocodilians do not chew their food in the same way that mammals do; instead, they tend to tear their food apart. Their teeth are primarily used for grasping and holding prey rather than for chewing.
- **Conclusion:** This option is correct as well.

5. **Analyzing the Fourth Option: "All the above":**
- Since all the previous statements regarding crocodilian teeth are correct, this option, which states that all the previous options are true, is also correct.
- **Conclusion:** This option is correct.

### Final Answer:
The correct answer is **"All the above."**