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13.4 Blume

Sara Zollo

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
Created by: szollo:)