This is true because at very high temperature, ALL the molecules have enough energy to react, but they must have a collision and the proper geometry even so. Catalysis Catalysts can greatly influence the energy of activation. They change the nature of the activated complex, usually by influencing the electronic structure of the reactants and lowering their bond dissociation energy. Thus the Energy of activation can be lowered and the rate of a reaction increased at a given temperature. Sometimes they even stabilize the activated complex so much that it becomes a real reactive intermediate.
Enzymes are natures catalysts for the reactions that make life work.
Enzymes are great catalysts because they can increase the A factor and decrease the energy of activation at the same time, both of which increase the reaction rate without increasing the temperature. They can affect A by grabbing the reactants out of solution by binding to the active site of the enzyme, thus increasing the probability the reactants will approach each other. They are also good at orienting the reactants just right for the reaction, improving the steric factor considerably.