Answer the following question given this paragraph: 

and procaine. Not only do catalysts greatly increase the rates of reactions, but in some cases such as in petroleum refining, they also control which products are formed. The acceleration of a reaction by a catalyst is called catalysis.


Q: Catalysts can greatly increase the rates of chemical what?

 Choices:

- photosynthesis

- decay

- effects

- reactions

A:
reactions
