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Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.
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When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?
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Why is it possible for an active metal like aluminum to be useful as a structural metal?...
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