Which of these molluscs commonly have a coiled shell?

Name: Which of these molluscs commonly have a coiled shell?
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Gastropods, such as snails and slugs, commonly have coiled shells. Bivalves, such as clams and oysters, have two connected shells that are not coiled. Cephalopods, such as squid and octopuses, have a more complex body structure and do not have a shell, or have a reduced internal shell.

Which of These Molluscs Commonly Have a Coiled Shell