The phrase 'decreases the activation energy' BEST describes the effect of a catalyst on a chemical reaction.
A catalyst is any substance that speeds up the rate of a chemical reaction by lowering its activation energy.
Activation energy refers to the minimum amount of energy required to carry out a chemical reaction.
In an organism, enzymes (proteins) are natural catalysts required during most of the metabolic reactions.
In a chemical reaction, the catalysts react with the reactants in order to form intermediates and subsequently produce the final products of the reaction.
In conclusion, the phrase 'decreases the activation energy' BEST describes the effect of a catalyst on a chemical reaction.
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