問題詳情
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
(A) Nematoda
(B) Platyhelminthes
(C) Arthropoda
(D) Mollusca
(E) Porifera
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