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by a tiny grain of sand actually, they're not. the PEARLS are formed by a tiny grain of sand.
crabs live in shells. so do clams, oysters, and scallops
Their shells grow as the organism grows
clams, oysters, or mussels
Oysters and mussels do not shed their shells. They are bivalve molluscs and their shells grow larger with age.
crabs live in shells. so do clams, oysters, and scallops
oysters make shells
No. Oysters are mollusks, which have shells rather than bones.
Oysters live in the water, and thus have an abundance of water. They die if they dry up, but can conserve water by closing their shells.
The oyster-catcher!
The oyster's shell provides protection from predators. Oysters do not need to shed their shell because the eat and expel waste products buy opening their shells and pumping water in and out with hairlike structures call cilia.
Because the name Bivalve literally means two shells. Oysters have two shells, Clams have two shells, Scallops have two shells, etc.