Assertion: crustacean's exoskeleton | /r/HasProperty | thick
Facets:
Source sentences:
text: All crustaceans have bilaterally symmetrical bodies covered with a chitinous exoskeleton, which may be thick and calcareous (as in the crayfish) or delicate and transparent (as in water fleas).
text: The exoskeleton in crustaceans is rich with calcium carbonate and is particularly hard and thick.