Snakes regularly protrude their tongue as the latter is

Options

A. Sensory
B. Catches small insects
C. Excertory
D. Dissipates body heat.

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks why snakes regularly protrude their tongue. We need to identify the function of the snake's tongue from the given options.

2. **Analyzing the Options**:
- **A. Sensory**: This option suggests that the tongue has a sensory function.
- **B. Catches small insects**: This implies that the tongue is used to catch prey.
- **C. Excretory**: This suggests that the tongue has a role in excretion.
- **D. Dissipates body heat**: This implies that the tongue helps in regulating body temperature.

3. **Evaluating Each Option**:
- **Option A (Sensory)**: Snakes use their tongues to sense their environment. They flick their tongues to collect chemical particles from the air, which they then analyze using the Jacobson's organ. This makes this option likely correct.
- **Option B (Catches small insects)**: Snakes do not use their tongues to catch insects; they use their mouths for that. This option is incorrect.
- **Option C (Excretory)**: The tongue does not play a role in excretion for snakes. This option is also incorrect.
- **Option D (Dissipates body heat)**: The tongue does not function to dissipate body heat. This option is incorrect as well.

4. **Conclusion**: After evaluating all the options, the only correct answer is that snakes regularly protrude their tongue as the latter is sensory.

### Final Answer:
Snakes regularly protrude their tongue as the latter is **sensory**.