The clams can survive outside of its shell. When they detect danger, clams will withdraw the tubes they use to breathe and eat into their shells and clamp down on them to keep them shut.
The clams are Molluscans that belong to the Bivalvia class. A soft-bodied organism with two roughly inverted bowl-shaped shells around it, the clam. Typically, they live on ocean floors. Clams have two equal-sized shells connected by two adductor muscles and a powerful digging foot. They had gills for the exchange of gases. Its surrounding structure resembles a tentacle and aids in catching and processing food. The mantle secretes the outer shell that covers the clams.
Hence, clam's shell only provides protection.
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