Which of the following does NOT describe catalysts? A
They are usually proteins.

B
They increase the speed of a chemical reaction.

C
They are permanently altered in a chemical reaction.

D
They are substrate specific.

Consider the following planned experiment. factor experimental group control group light exposure tots of sun tots of sun amount of water weekly weekly type of soil nutrient rich nutrient rich size of pot large which variable is being tested in this experiment? small a. size of pot b. type of soil c. light exposure d. amount of water