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ppk ppk
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Posts: 3561
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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12 years ago
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