55. The outer-to-inner sequence of tissue layers in a post-gastrulation vertebrate embryo is____________.
(A) endoderm ectoderm - mesoderm
(B) mesoderm → endoderm → ectoderm
(C)ectoderm → mesoderm → endoderm
(D) ectoderm endoderm → mesoderm

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統計: A(2), B(6), C(90), D(2), E(0) #2911811

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