Which of the Following Statements Are True of the Embryonic

Which of the following statements are true of the embryonic membranes? (Read carefully and select all of the correct statements.)

A) The amniotic sac surrounds the fetus and contains fluid.
B) The yolk sac provides the first nutrients for the embryo.
C) The chorion will form the maternal part of the placenta.
D) The first fetal blood cells are made by the amnion.
E) The embryonic membranes are not part of the fetus, but are made of fetal tissue
F) The yolk sac becomes a cushion for the embryo.