Assertion: barnacle's shell | /r/HasProperty | the exoskeleton
Facets:
Source sentences:
text: Because they have a hard outer shell (the exoskeleton) that does not grow, they must shed their shells, a process called molting.
text: Animals that live high on rocks, like barnacles and limpets, have very hard outer shells (called exoskeletons) that protect them from becoming dinner for hungry seagulls!