Which of the following is an example of microevolution? A. the formation of four new species of fish in a lake over thousands of years
B. a mass extinction that occurs because of major environmental changes in a habitat
C. a change in the frequency of body color in a species of beetle over time
D. the formation of two new species of rodent that have been isolated by a mountain range

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it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.