| A | B |
|---|
| Mollusk | An invertebrate with a soft body that is often covered by a hard shell |
| Gastropod | A class of mollusk whose name means "stomach foot" |
| Bivalve | A class of mollusk characterized by two shells hinged together |
| Cephalopod | A class of mollusk whose foot is divided into tentacles |
| mantle | produces the shell of mollusk |
| radula | a tongue like structure in the gastropod that scraps up organic matter |
| regeneration | the ability to regrow lost body parts |
| tube feet | cuplike structure for suction that helps echinoderms move |
| Echinodermata | A phyla of animals characterized by spiny skin and tube feet |
| endoskeleton | a skeleton or structure that is located inside the body |
| ganglia | a mass of nerve cells |
| open circulatory system | a circulatory system where the fluid is not contained in blood vessels |
| closed circulatory system | a circulatory system where the blood is contained in blood vessels |
| water vascular system | a system of fluid filled internal tubes that carry food, oxygen and wastes of an echinoderm |
