What allows fetal hemoglobin to remove oxygen from maternal hemoglobin?
A. Fetal blood contains twice as many hemoglobin molecules than maternal blood.
B. Fetal hemoglobin molecules are much larger than maternal hemoglobin molecules.
C. Fetal hemoglobin has an extra heme group.
D. Fetal hemoglobin has a higher affinity for oxygen than does maternal hemoglobin.
E. Oxygen is more soluble in fetal blood than maternal blood.
Answer: D
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