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What is the CO2 concentration in the atmosphere?
A0.03 to 0.04 per cent
B0.003 to 0.004 per cent
C3.0 to 4.0 per cent
D0.3 to 0.4 per cent
Answer & Solution
Correct answer: A. 0.03 to 0.04 per cent
Air holds only 0.03 to 0.04 per cent CO2, so it is the major limiting factor.
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