(Help needed) Which of the following systems has potential energy only? A) Bird sitting on a branch of a tree
B) A stone falling from a height
C) A ball rolling down an inclined plane
D) A flying bird

Ais your answer to this

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.

Are there any options that could alot..