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:
Flucuated between hot and cold periods
Answer:
all of them you put are correct except the first one
Explanation:
pluto isn't considered a planet due to its size
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The water molecules move by osmosis into the cell from high water concentration to low water concentration.
Answer: The gas of Fire constrains the atoms that make up oxygen in the air. Plants release oxygen, and take in carbon dioxide.
