Will give brainliest and 50 points if correct 4. What process is happening in the figure above?

A. Zygote
B. Fertilization
C. Diploid
D. Haploid

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i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

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.