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On average, what percentage of infants born to 45-year-old mothers have down syndrome
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Which best describes the nucleus of an atom a. it is where all of the particle s of the atom are located b. it is the negatively charged part of the atom c. it is where the electrons and the protons are located d. it is the part of the atom with the greatest mass
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What's the waste product of electrons and pyruvate combining in fermentation?
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On average, what percentage of infants born to 45-year-old mothers have down syndrome...
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