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Ablastocyst is a group of cells that forms after a human egg is fertilized. the blastocyst consists of two types of cells. some of these cells will become the placenta. what do the other cells develop into?
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Restless tectonic plates move (shift) between one and fifteen centimeters per year month day minute
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Which b vitamin is especially important for women of childbearing age to prevent neural tube defects...
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