What are three types of genetic variation

The three types of genetic variation: mutation, gene flow, and sexual reproduction.

Explanation:

A mutation is the permanent change in the DNA sequence.

Gene flow is the transition from one group to another of genetic variation.

I hope I don't have to explain sexual reproduction.

If you have any questions feel free to ask in the comments - Mark

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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.