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Under normal conditions, external respiration is a subconscious process that occurs at a rate of:A.20 to 30 breaths/min, averaging 25 breaths/minuteB.30 to 40 breaths/min, averaging 35 breaths/minuteC.15 to 25 breaths/min, averaging 20 breaths/minuteD.12 to 20 breaths/min, averaging 16 breaths/minute
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