Describe the placenta.
A) The placenta is a layer of cells that surround the yolk sac.
B) The placenta forms the interface between the inner cell mass and the trophoblast.
C) The placenta forms the interface between the embryonic/fetal system and the maternal system.
D) The placenta forms the interface between the blastocoele and the amniotic cavity.
E) The placenta contains fluid that surrounds and cushions the embryo or fetus.
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