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  • 3. Respiration In Organisms(7)
  • An adult human being at rest breathes in and out _______ ...
Multiple choice

An adult human being at rest breathes in and out _______ times in a minute.

  1. 20-21

  2. 12-13

  3. 15-18

  4. 30-31

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

15-18 is the normal breahing rate in human beings.

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