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NAZ NAZ
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13 years ago
 1) It is easy to see that starfish exhibit radial pentamerous symmetry. Sea urchins also exhibit the same type of symmetry. Given that sea urchins do not have arms, how can you tell they are radially pentamerous?
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wrote...
13 years ago
Each white band is the location of a row of tube feet; each pair of white bands is called an ambulacrum. There are five such ambulacra; the fivefold symmetry reveals a kinship with starfish.
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13 years ago
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