what usually has a shell?
an object humans animals density tortoises barnacles h2o oysters
A B C D E F G H
Clams, oysters and snails are familiar mollusks.
most oysters have shells
what usually has a shell? (A) an object (B) humans (C) animals (D) density (E) tortoises (F) barnacles (G) h2o (H) oysters