What is nature of exoskeleton of cockroach? List its functions.

Explanation

### Step-by-Step Solution:

1. **Understanding the Exoskeleton of Cockroach**:
- The exoskeleton of a cockroach is primarily composed of a substance called chitin, which is a type of protein. This structure is referred to as "sclerotized," meaning it is hardened and provides rigidity.

2. **Nature of the Exoskeleton**:
- The exoskeleton is made of chitinous protein, which is stable and durable. This stability allows cockroaches to thrive in various environments, including extreme conditions.

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