No species of snail is able to 'leave' its shell. The shell is connected to the snail like a permanent tooth. If it were to leave its shell it would die. so unfortunately the snail probably died, or was eaten by a predator.
Because they overgrow them and they leave them to find a bigger shell.
they live in the shells.
most have shells
They have shells.
Mollusks are defined as Bivalves. They are called Bivalves because they have two shells. Cnidarians such as Jelly Fish do not have shells which define a bivalve (mollusks).
Mollusks have soft body and hard shells but some don't even have shells.
clown fish
Slugs,Octopus
Yes, they are mollusks as well
crustations
Mollusks are soft bodied animals that can have no shells,1 shell or even 2 shells. Snails, clams, sea slugs, clams, scallops, oysters, octopuses, and squid, are some types of Mollusks.
Norman W. Lermond has written: 'Shells of Maine' -- subject(s): Mollusks 'Shells of Maine' -- subject(s): Mollusks
mollusks are slow-moving in the way that they are soft-bodied animals and protected by shells.