Q:

During the second week of development:

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During the second week of development:


  1. the trophoblast differentiates into cytotrophoblast and syncytiotrophoblast
  2. the utero placental circulation begins
  3. the inner cell mass differentiation into hypoblast and epiblast
  4. primary stem villi appear
  5. all of the above (A-D)

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E. all of the above (A-D)

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