याद कार को 15m/Sec
chal से जाता hai तो उनके द्वारा
3ghnte 20 minute me तय की गयी
tatal doori gyat kijiye

tracks, burrows, eggshells, nests, tooth marks, or gastroliths

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.