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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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12 years ago
Human trophoblasts     
A) form the inner cell mass.
B) are the precursors of the mesoderm.
C) form from ectoderm.
D) are of maternal origin and function in embryo gas exchange.
E) are of embryonic origin and function in embryo nutrition.
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bio_manbio_man
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