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ppk ppk
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The outer-to-inner sequence of tissue layers in a post-gastrulation vertebrate embryo is   
A) ectoderm ? mesoderm ? endoderm.
B) endoderm ? mesoderm ? ectoderm.
C) mesoderm ? endoderm ? ectoderm.
D) endoderm ? ectoderm ? mesoderm.
E) ectoderm ? endoderm ? mesoderm.
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bio_manbio_man
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