Gastro= Stomach Pod= Foot Because they're basically comprised of a stomach (gastro) and a foot (pod) IE slugs, snails, conch etc.
Gastropods are a class of mollusks, otherwise known as snails, slugs, and limpets.
Circulate is the album, the album by Neil Sedaka
A few gastropod species are snails, slugs, limpets, and sea hares. I know this doesn't really answer the question very well, but if you search 'Gastropod' at Wikipedia you will find out what a...
they defend themselves with their shells