Catalysts affect the chemical reactions that take place within the body. What function do catalysts perform in chemical reactions? a. Catalysts slow down the rate of chemical reactions. b. Catalysts are always formed by chemical reactions. c. Catalysts are used up during a chemical reaction. d. Catalysts lower the activation energy of a chemical reaction

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I think the best answer for this is D.  Catalysts lower the activation energy of a chemical reaction. Catalyst is a substance that speeds a chemical reaction. It is not consumed as the reaction proceeds. A catalyst offers a new route for faster reaction.

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