Sully has a painful experience at the dentist's. The next time his mother brings him to the dentist's, Sully gets tense and anxious. Sully's mother then takes him to a new dentist, Dr. Theron, who makes sure that Sully's visits are painless. Sully is anxious at first, but after a few visits, he no longer resists going to the new dentist. Sully's change in behavior can probably be best explained in terms of which of the following

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.

protistas excret ethanol used in the manufacture of vinegar