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Human skin color is primarily due to the presence of what pigment in the skin?
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Dec 30, 2024
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An axe head and a doorstop are types of what simple machine?
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Dec 30, 2024
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Alveolar ducts and broncioles are developing parts of what organ system?
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Dec 30, 2024
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All combustion reactions are what type of reactions?
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Dec 30, 2024
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