Enzymes are proteins that speed up chemical reactions in the body how do they work a. they increase the surface area of reactants b. they increase the concentration of reactants c. they decrease the concentration of products d. they act as reactants

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.