The concentration of $CO_2$ in the atmosphere is $...............$ and if the concentration of $CO_2$ is increased up to $\ldots \ldots \ldots$,it can lead to an increase in the rate of $CO_2$ fixation.
- A$0.01$ to $0.02 \%, 0.05 \%$
- B$0.1$ to $0.2 \%, 0.05 \%$
- C$0.3$ to $0.4 \%, 0.5 \%$
- D$0.03$ to $0.04 \%, 0.05 \%$
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