What ALWAYS happens at the autumnal equinox? Day and night are of equal length.
The sun shines for 24 hours straight over the north pole.
Animals go into hibernation.
Winter officially begins.

It was necessary to redeem the world and he knew that his son was the only way

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.

The answer is b electromagnetic i believe, i hope i ya out!