If you need to prepare 100 mL of a 2.0 M solution of CaCl2, how many milliliters of a 6.5 M solution of CaCl2 what you need.

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.

i don't know people like to fight everywhere rip.