Trivia: What valuable material can oysters produce?
The correct answer is Pearls
So why is this answer correct? : Oysters are the most common type of mollusk that make pearls, but technically, other mollusks such as clams, mussels, and scallops can create pearls, too. Pearls form when an irritant such as a parasite enters the body of a mollusk, which secretes layers of aragonite and conchiolin as a natural defense that builds up around the foreign body. This nacre (also called “mother of pearl”) encases the irritant, forming shiny, precious pearls that are often made into jewelry.