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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統計: A(0), B(1), C(4), D(12), E(0) #3205118

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