Chitin
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Example:
Imagine trying to protect your phone with a case that's both sturdy and lightweight. Just like how a phone case shields your device from damage while being easy to carry around, chitin serves as a protective barrier for insects and fungi, offering durability without adding much weight. In this analogy, the chitin is like the phone case; it provides a tough, resilient cover (like the exoskeleton or cell wall) that safeguards the delicate insides (insect organs or fungal cells) from external harm, much like how a case protects the phone from drops and scratches.

Practice Version

Chitin: Tough polysaccharide that makes up insect exoskeletons and fungi cell walls. Chitin. Chitin is a natural material that forms protective shells in insects and supports fungi structure.