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Eddi Din [679]
2 years ago
9

State two reasons why the fetal blood must not mix with the maternal blood?

Biology
1 answer:
gulaghasi [49]2 years ago
7 0

Answer:During pregnancy, red blood cells from the unborn baby can cross into the mother's blood through the placenta. If the mother is Rh-negative, her immune system treats Rh-positive fetal cells as if they were a foreign substance. The mother's body makes antibodies against the fetal blood cells

Explanation:

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