Snail fact of the day: Did you know? A key characteristic of mollusks is that they lack an internal skeleton or bones, but snails are not unprotected. In fact, the primary distinguishing physical characteristic of a snail is its spiral shell. Snails have a hard, protective shell coiled into a spiral shape. Composed of calcium carbonate, the shell grows with the snail throughout its life and protects its internal organs, including its lung—unlike aquatic snails, land snails breathe air. The snail continuously adds calcium carbonate to the shell's edge until it reaches its adult size. The shape and size of the shell can vary widely depending on the species, with some featuring ornate patterns or colors.
〔•෴•〕 < I was pretty confident snails were mollusks until you mentioned this... Now I think they're shell-fish! // HOO HOO! //
Hehe! Happy to be around! I've been busy teaching summer school... Very very rowdy children!