What of the following describes how an organism responds to external stimuli?

a. a mouse runs away from a cat that is chasing it

b. a person yawns when oxygen levels are low in the lungs

c. a person sweats when hormones increase heart rate

d. the human body reduces sweating when internal water levels are low

Yes, your answer should be and is A. a mouse runs away from a cat that is chasing it.

Hope this helped!

Idk the answer sorry

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.