A 16-called embryo is Called A Morula
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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If the number of snakes increased, the number of rabbits decrease.
If the number of insect eating birds decreased, the amount of grass increases.
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