Air contains __________ % of CO2 ?
Correct answer: B. 0.03-0.04
- A. 0.02-0.03
- B. 0.03-0.04
- C. 0.04-0.05
- D. 0.05-0.06
Explanation
Atmospheric carbon dioxide is approximately 0.03% to 0.04% in the traditional textbook value used in many biology examinations. Students may choose 0.04% to 0.05% because modern atmospheric carbon dioxide is close to 0.04% and is increasing, but the submitted key follows the conventional textbook range.
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