Assertion: mussel | /r/HasAspect | two shells
Facets:
Source sentences:
text: Mussels are a type of bivalve mollusc; they have two shells which hinge together.
text: Live clams, oysters, or mussels should have shells that look moist and are tightly closed.
text: Each mussel has two shells�one left valve and one right valve�that protect the soft-bodied animal from predators.
text: Clams and mussels have two shells that open and close like a book.