In a metallic bond, electrons are shared are completely transferred between bonded atoms move freely between the clouds of several atoms move from a high energy level to a low energy level within one atom abc or d?

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.