Assertion: crustacean's exoskeleton | /r/HasProperty | chitin
Facets:
value: partially
type: DEGREE
Source sentences:
text: As mentioned earlier, the crunchy exoskeleton of insects like grasshoppers is partially composed of chitin, a substance not digested by humans.
text: The exoskeleton of a chelicerate is a hard external structure made of chitin that protects the arthropod, prevents desiccation, and provides structural support.
text: This exoskeleton is composed of protein and chitin and hardened with lime salts.