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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?
Calcium
Zinc
Iron
Manganese
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Which metal contains 60% copper and 40% zinc?
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What are chemicals that reduce or prevent oxidation called?
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A lack of iodine in your diet leads to which medical condition?
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Holmium on the periodic table is noted by which symbol?
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What is the common name of the chemical compound H2O?
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Which of these is an odorless and colorless gas?
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Which of the following carries a positive charge?
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