Which of the following is a benefit provided by fetal hemoglobin?
A) It transfers O2 from adult hemoglobin to the fetus.
B) It releases O2 at a lower partial pressure than adult hemoglobin does.
C) In the placenta, O2 diffuses from adult hemoglobin to fetal hemoglobin.
D) At low O2 pressures, it is less likely to pick up oxygen than adult hemoglobin is.
E) It occurs in higher density in red blood cells than adult hemoglobin does.
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