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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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Which of the following factors does not affect soil formation? a. precipitation b. time c. erosion d. none of the above
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What was Rudolf Virchow trying to prove through his work...
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