Which of the following best describes how an electron moves when it absorbs or releases exact amounts of energy?
a. the electron moves to the ground state.
b. the electron moves between orbital levels. c. the electron moves to bond with other electrons. d. the electron moves beyond ionization potential.

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.

the answer to this question is 3.