Assertion: barnacle's exoskeleton | /r/MadeOf | chitin
Facets:
Source sentences:
text: As with all crustaceans, a barnacle's body is encased by a hard exoskeleton made of chitin.
text: Exoskeletons made of chitin Highly developed sense organs
text: Arthropods’ hard exoskeletons is made of chitin – which is made of a derivative of the sugar glucose!
text: They have exoskeletons made of chitin.