Chemistry
In RNA thymine from DNA is replaced by what?
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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 common element in the metal alloys bronze and brass?
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Clocks made out of what alkali metal are considered the most accurate of all clocks?
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How many electrons are in the third ring of the atom Chlorine?
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From all salt elements, which group is most soluble?
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The red color of rubies is caused mainly by the presence of what element?
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The noble gases that make up Group XVIII of the periodic table is also known as which of the following?
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What is the name of the temperature at which Helium I becomes Helium II?
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