Explain the role of nitrifying bacteria and denitrifying bacteria during nitrogen cycle

Denitrifying bacteria - Microorganisms whose action results in the conversion of nitrates in soil to free atmospheric nitrogen, thus depleting soil fertility and reducing agricultural productivity.

Nitrifying bacteria - Convert the most reduced form of soil nitrogen, ammonia, into its most oxidized form, nitrate.

2%? i tried finding the exact sorry if it's not 100% correct ; -;

not sure if this is what you'r looking for eubacteria and archaebacteria