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