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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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ppk ppk
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13 years ago
Although it contributes no cells to the embryo, the formation of the primitive streak is guided by the structure known as the   

A) neural crest.      B) endoderm.      C) hypoblast.      D) mesoderm.      E) ectoderm.
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bio_manbio_man
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