Why are bacteria needed in the nitrogen cycle?

Bacteria helps nitrogen change states so it can be used by plants since plants can’t absorb nitrogen as a gas in its natural state and instead they need fixed nitrogen in order to absorb it. They get it through nitrification, a process where the bacteria converts nitrogen gas into ammonia that then gets converted into nitrates which the plants then are able to absorb and once the plants are eaten by animals, they pass off that nitrogen to them.

Idont know but good luck; )