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Blume Ch 13.4

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
What do echinoderms have that is a hard covered bumpy or spiny epidermis?   endoskeleton  
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What type of symmetry do echinoderms have?   radial symmetry  
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What does water-vascular system mean?   a network of water-filled canals connected to thousand of tube feet  
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What does the water-vascular system allow echinoderms to do?   move , exchange carbon dioxide and oxygen, capture food, and remove waste  
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About how many species of echinoderms exist?   6,000  
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What number of echinoderms have at least 5 arms arranged around a central point; reproduce sexually; and regenerate a lost arm?   1/3 or 33%  
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What type of echinoderm allows a predator to break off an arm, while the brittle star escapes ;they quickly regenerate the lost arm   bristle stars  
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What type of echinoderms are disk- or globe-shaped animals covered with spines?   sea urchins and sand dollars  
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What echinoderms are soft-bodies with a leathery covering?   sea cucumbers  
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How do echinoderms help the environment   they recycle materials and are used in research as possible medicine sources  
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