Breathing rate: 1 Mark
Normal breathing rate: 1 Mark
Variation: 1 Mark
Breathing rate is the number of times a person breathes in a minute. One full inhalation and one full exhalation is counted as a single breath. The number of breaths per minute is calculated for a person to obtain the breathing rate.
The normal breathing rate for human beings during rest is 15 to 18 breaths per minute. 
Breathing rate increases during exercising or running. It slows down when sleeping.