mantle
The mantle of a mollusk secretes calcium carbonate to form the shell.
The mantle (the inner portion of the mantle to be exact).
A mollusk is a sea creature that lives within a shell. A cobra does not live in a shell.
This is a bivalve mollusk.
THey use a shell
the function of the its shell is to protect the mollusk's very vulnerable and sensitive organs.
Pearls are not formed in eggshells, rather they are created inside the shells of certain mollusks like oysters and mussels. When an irritant enters the shell, the mollusk secretes layers of nacre around it, eventually forming a pearl.
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.
no
slug
yes
A shell