| A | B |
|---|
| echinoderm means | spiny skin |
| internal skeleton that is formed of hardened plates of calcium carbonate | endoskeleton |
| Echinoderms have a system of internal tubes called | water vascular system |
| connects to a ring canal that forms a circle around an animal's mouth | madreporite |
| structure that operates much like a suction cup | tube feet |
| Class that include sand dollars, sear stars, and feather stars | echinoderms |
| echinoderms that have a large, solid plate that form a box around their internal organs | sea urchins and sand dollars |
| echinoderms that have slender, flexible arms and can scuttle around quite rapidly to escape predators | brittle stars |
| echinoderms that look like warty, moving pickles | sea cucumbers |
| best known group of echinoderms | sea stars |
| when pulled into pieces, each piece will grow into a new animal | sun star |
| Oldest class of the echinoderms | sea lilies and feather stars |
| A major threat to coral reefs is the sea star called | crown-of-thorns |
| echinoderm that helps control the distribution of algae and other forms of marine life | sea urchins |
| The side of the echinoderm in which the mouth is located | oral surface |
