Air contains __________ % of CO2 ?
Tap an option to check your answer.
✅ Correct answer: B. 0.03-0.04
Option A: 0.02-0.03
Option B: 0.03-0.04
Option C: 0.04-0.05
Option D: 0.05-0.06
Correct Answer : 0.03-0.04
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