Which of the following is evidence of succession?
a. fossils that show a change in communities in the same region over a period of time

b. fossils that show a change in populations throughout different regions of the world

c. rocks that show a change in shallow roots that has occurred over a long period of time

d. rocks that show a change in climate that has caused wind erosion in various regions

This correct answer for this question , is A.

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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.