To pass between maternal and fetal blood, substances must pass through the placental barrier, which consists of layers of each chorionic villus, plus the endothelium of the fetal capillaries in the villi.

Is a hamster and guinea pig part of the same species ?

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How did the discovery of the rhesus factor affect society? o more patients died from having a transfusion with the wrong rhesus factor 0 new treatments during pregnancy could prevent harm to the developing child. o less donated blood could be used in the treatment of patients. the number of blood types was reduced by half