The Calvin Cycle:. a. is a cyclic pathway that produces three carbon molecules from CO 2.
b. is a linear pathway that produces three carbon molecules from CO 2.
c. is a cyclic pathway that produces ATP and NADPH.
d. is a linear pathway that produces ATP and NADPH.

a. The Calvin Cycle: is a cyclic pathway that produces three carbon molecules from CO 2.

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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.