On an average , an adult human being at rest breathes in and out ............ times in a minute.

15-16

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15-20

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15-18

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15-22

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Solution

The correct option is D 15-18
A healthy adult takes approximately 12 to 16 breaths per minute, according to the University of Rochester Medical Center. Children have higher respiratory rates. For example, an infant takes 30 to 60 breaths per minute, whereas a school-aged child takes 18 to 30 breaths per minute.
Therefore, the correct answer is option C.

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