A thick layer of cuticle on the surface of Ascaris indicates

Options

A. Reproduction
B. Growth
C. Parasitism
D. Evolution

Answer

To answer the question regarding what a thick layer of cuticle on the surface of Ascaris indicates, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Ascaris**: Ascaris is a genus of parasitic worms, commonly known as roundworms, that infects the intestines of hosts, including humans.

2. **Function of the Cuticle**: The cuticle is a protective outer layer that serves several functions. In the case of Ascaris, it plays a crucial role in protecting the worm from the harsh environment of the host's digestive system.

3. **Adaptations for Parasitism**: Ascaris and other parasitic organisms have evolved various adaptations to survive in their hosts. One of these adaptations is the thick cuticle, which helps the parasite resist the digestive enzymes and immune responses of the host.

4. **Eliminating Other Options**:
- **Reproduction**: The cuticle does not directly aid in the reproductive processes of Ascaris.
- **Growth**: While the cuticle may provide some structural support, it is not primarily responsible for growth.
- **Evolution**: The cuticle itself is not an indicator of evolutionary processes but rather a result of adaptations to a parasitic lifestyle.

5. **Conclusion**: Therefore, the presence of a thick layer of cuticle on Ascaris indicates its adaptation to a parasitic lifestyle, specifically to protect it from the host's digestive system.

### Final Answer:
The thick layer of cuticle on the surface of Ascaris indicates **parasitism**.