Human beings use _______ liters of pure oxygen per day.
Correct answer: A. 550
- A. 550
- B. 2500
- C. 1,050
- D. 10,000
Explanation
An average person consumes roughly 550 litres of oxygen per day at rest under commonly used textbook estimates. This is oxygen actually used by metabolism, not the much larger volume of air inhaled.
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