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Home Q & A Board Biology-Related Homework Help Medicine Nursing and Clinical
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robsoria1 robsoria1
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6 years ago
The following is true of the placenta:
 
  a. It is formed from trophoblast cells at the site of implantation.
  b. Maternal and fetal blood mix in nutrient exchange.
  c. The placental barrier protects the fetus from viral infections.
  d. It begins functioning at the 6th week of em-bryonic development.
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oliviabowlingoliviabowling
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6 years ago
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robsoria1 Author
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6 years ago
You make an excellent tutor!
sweetalia
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Yesterday
Just got PERFECT on my quiz
Harvinder
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2 hours ago
Thanks
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