What is the term that is used to describe a key factor required to start a fission reaction?
chain reaction
critical mass
neutron absorption
neutron moderation

The correct option is neutron absorption

Nuclear fission is the reaction in which a big nucleus is divided into smaller nuclei. The reaction is very dangerous and it is handled very carefully. It can be started by bombarding slow neutrons on a bigger nucleus. Since bombarding is actually inducing the neutron so we can refer it to absorption too. Therefore, the correct answer is absorption

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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.