A bivalve.
clams, oysters, or mussels
Shells are grown by shellfish to cover their insides.
Because they don't have shells that come off technically they are not shellfish.
They have shells.
A sedimentary rock formed from deposits of shells is called limestone. Limestone is made up primarily of calcium carbonate, which is derived from the shells of marine organisms like coral or shellfish.
because the are wearing shells
because shells have some greams in them
Sea otters are known to feed on shellfish like clams and mussels by using their teeth to crack open the shells. They balance the shellfish on their chest as they float on their backs and use rocks to break open the shells.
Shellfish are actually not fish at all. The term shellfish refers to aquatic invertebrates with shells, including lobster, shrimp, clams, and sea urchins; all mollusks, crustaceans, or echinoderms, rather than fish, who lack shells and are vertebrates.
The word refers to "bivalve," which is a type of shellfish characterized by having two hinged shells, or valves, that protect its soft body. Common examples of bivalves include clams, oysters, and mussels. They typically live in aquatic environments and are known for their ecological role as filter feeders. Bivalves are also significant in various culinary traditions and are often harvested for food.
No they are not an arthropod.
Clams and scallops are two kinds of shellfish.