Chemistry
What element is the basis for organic chemistry, as it occurs in all living organisms?
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What isotope of carbon can be used to figure out how old some objects are or when something died?
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What is the unit defined as the energy needed to raise one gram of water by 1 degree Celsius?
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What is the second most abundant element by mass (about 18.5%) in the human body?
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An atom of which of the following elements has the smallest volume?
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Which of these is a heavy gas used in specialized electric lamps?
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