How does the diaphragm aide in breathing? A. When the diaphragm contracts, the lungs expand and allow
oxygen to enter
B. When the diaphragm relaxes, the lungs expand and allow
oxygen to enter
C. The diaphragm does not work with the respiratory system

iron and sleel

make siroeel

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.