Consider the two statements:
I. Elevated atmospheric CO2 increases the instantaneous rate of photosynthesis in C3 plants.
II. Current availability of atmospheric CO2 level is limiting to the C3 plants.
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct but II is incorrect
4. Both I and II are incorrect
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