If a catalyst is used in a reaction: question 13 options: the reaction rate increases. the reaction rate does not change. the equilibrium shifts. the energy of activation increases.

answer; i believe that the correct answer is (a) potassium(k)

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.