Plz help asap! The availability of which of the following factors would directly limit the productivity of the Calvin cycle? CO2
Light
Water

I only
II only
I and II only
II and III only

II and II only

Explanation:

i just took the quiz and i got an A

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

the answer is :