Which of the following is an input for cellular respiration? a. co2 b. h2o c. sunlight d. o2g

D - O2

Cellular respiration's equation is the reverse of photosynthesis, thus making the reactants or inputs of it C6H12O6 and 6O2.

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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.