Chemistry

Which of these is a chemical form of communication?

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What does the gall bladder secrete?
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What is protein made of?
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What orbital is described by the quantum numbers: n=3 and l=2?
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Which of those would you use to perform a metathesis reaction?
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Which scientist was the first to discover that for DNA, "A=T and C=G"?
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Neptunium on the periodic table is noted by which symbol?
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What is a method to indicate reactants and products of a chemical reaction using chemical formulas?
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What was the fifth unearthly element from the days of Aristotle?
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