Assertion: mollusk | /r/CapableOf | produce pearl
Facets:
Source sentences:
text: Most molluscs with shells can produce pearls, but only the pearls of bivalves and some gastropods, whose shells are lined with nacre, are valuable.(pp300–343, 367–403)
text: Which Mollusks Make Pearls?
text: Most molluscs with shells can produce pearls, but only the pearls of bivalves and some gastropods, whose shells are lined with nacre, are valuable.