42 As you are walking along a beach, you find an animal and believe that it belongs to the class Asteroidea. Which characteristics would support your hypothesis that the animal is a sea star, not another type of echinoderm?
(A)It is radially symmetric.
(B)It feeds on other animals.
(C) It has a hydrostatic skeleton formed from its water vascular system.
(D) it has five or more appendages.
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統計: 尚無統計資料
統計: 尚無統計資料