Ozone is concentrated in earths atmosphere at an altitude of 20 to 35? kilometers which atmospheric layer contains the greatest concentration of ozone

Iwould go with i'm not positive because i'm dumb that

You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.