Assertion: mollusk's exoskeleton | /r/MadeOf | chitin
Facets:
Source sentences:
text: a large class of mostly water-dwelling arthropods with exoskeletons made of chitin and paired, jointed limbs; includes lobsters, crabs, shrimps, and barnacles, characteristically having a segmented body
text: Furthermore, mollusks have mantles that secrete calcareous outer or inner shell while arthropods have an exoskeleton made up chitin.