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Chemistry
What is a vital constituent of plant and animal life, and is the key component of hemoglobin?
Chemistry
What is a vital constituent of plant and animal life, and is the key component of hemoglobin?
Manganese
Zinc
Iron
Calcium
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What happens to water when it freezes?
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What is a substance made from only one type of atom called?
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Which of these is an element?
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The study of the effects of light on chemical reactions is known as what?
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Which element was the first ever artificially created?
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The red color of rubies is caused mainly by the presence of what element?
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In an ethyne molecule, what is the hybridization of each of the carbons?
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