An earthquake's epicenter is
a. the place on earth's surface directly above the focus
b. a spot halfway between the focus and the surface
c. the spot below the focus
d. any spot along the nearest fault

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

allowed for the prediction of the properties of missing elements.