What happens during nitrogen fixation

(help this is due today)

Nitrogen fixation is the process by which atmospheric nitrogen is converted by either a natural or an industrial means to a form of nitrogen such as ammonia. In nature, most nitrogen is harvested from the atmosphere by microorganisms to form ammonia, nitrites, and nitrates that can be used by plants.

Very minute and important evidence needs to be collected in order together detail and figure out what had happened