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A mollusk is a sea creature that lives within a shell. A cobra does not live in a shell.
the function of the its shell is to protect the mollusk's very vulnerable and sensitive organs.
THey use a shell
Every mollusk except slugs, which have evolved to not need a shell, has a shell. Snails, clams and other bivalves have an external shell. Octopi, squid and cuttlefish have an internal shell.
yes
no
slug
jellyfish
A shell
It is a shell, as in a cockle shell or oyster shell.
no..... slugs are mollusks and they don't have a shell
it is a squid