53. Which of the following statements regarding vertebrates is correct?
(A) Chondrichthyans have operculum.
(B) Amphibians are amniotes.
(C) Marsupials have fully developed placenta.
(D) Osteichthyans have swim bladders.
(E) None of the above.
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1. 題目解析 這道題目考查的是對脊椎動...
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