58. A gastrovascular cavity, with a single opening, is the characteristic digestive system of animals in which phylum?
(A) Nematoda
(B) Platyhelminthes
(C) Arthropoda
(D) Mollusca
(E) Porifera
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Platyhelminthes 和cni...
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A gastrovascular ca...
阿摩線上測驗
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