()a scientist observes that, when the ph of the environment surrounding an enzyme is changed, the rate the enzyme catalyzes a reaction greatly decreases. which statement best describes how a change in ph can affect an enzyme? 1points a a ph change can cause the enzyme to change its shape. b a ph change can remove energy necessary to activate an enzyme. c a ph change can add new molecules to the structure of the enzyme. d a ph change can cause an enzyme to react with a different substrate.