[["While slugs have no apparent shell, some species may have a reduced shell, or one that is internal, and therefore not visible. It is believed that the first mollusc-like animals were shell-less, with reduced or internal shells emerging later, and external shells evolving after that.", 123.0], ["That is so you can watch it foam up when you pour salt on it", 4.0]]
why don't slugs have shells
animals,snails