Mrs. Zerlinsky wrote a chemical equation on the board and asked her class what should be changed to make it correct. She wrote:

water + glucose → carbon dioxide + oxygen + energy

What should be changed to show the correct chemical reaction?

Decomposition is the cycle at which bacteria breaks down any organic material into the soil

Ions gain or lose electrons

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.