75. Which of the following does NOT contribute to gas exchange in the human fetus?
(A) Maternal blood and fetal blood flow next to each other in the placenta.
(B) Maternal hemoglobin releases oxygen more easily than does fetal hemoglobin.
(C) Oxygen is carried through the umbilical cord to the fetus.
(D) The placenta keeps the oxygen levels of amniotic fluid very high.
(E) Fetal hemoglobin binds oxygen more readily than does maternal hemoglobin.
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