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13.4 Blume
Sara Zollo
| Question | Answer |
|---|---|
| Echinoderms have a hard ___________ covered by a bumpy or spiny epidermis; they are radially symmetrical, have a mouth, stomach, and intestines; they have no head or brain,but they do have a nerve ring around the mouth | endoskeleton |
| Echinoderms have a ________ system, a network of water-filled canals connected to thousands of tube feet. | water-vascular |
| The water-vascular system allows echinoderms to _______, exchange carbon dioxide and oxygen, capture ________, and remove wastes. | move;food |
| About ________ species of echinoderms exist. | 6,000 |
| ________ have at least five arms arranged around a central point; they reproduce sexually and can regenerate a lost arm. | sea-stars |
| ___________ allow a predator to break off an arm, while the brittle star escapes; they quickly regenerate the lost parts. | brittle stars |
| __________ and ______ are disk-or globe-shaped animals covered with spines. | sand dollars; sea urchins |
| __________ are soft-bodied with a leathery covering. | sea cucumbers |
| Echinoderms help ______ materials and are used in research as possible medicine sources. | recycle |
| Echinoderms date back more than _______ million years and more closely resemble vertebrates than any other group of invertebrates. | 400 |
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