Answer:
B
Explanation:
The answer is Medical asepsis and it is concerned mainly with eliminating the spread of disease causing microorganisms through facility practices, to prevent the spread of disease microorganisms from one patient to another.
Friction slows things down. For example when you are putting on breaks in a car the friction causes the car to stop because you are putting pressure on the shoe and drum.
Friction goes against applied force works against it causing the object motion to slow down.<span />
I am guessing the end to this question would be "on"? you never want to leave a fire uncovered and unattended
