Answer:
The correct answer is - nitrogen fixation and ammonification.
Explanation:
Nitrogen fixation is the process of the nitrogen cycle in which the assimilation of atmospheric nitrogen to the organic compounds or to the soil in the form of ammonia with the help of nitrogen-fixing bacteria takes place.
Ammonification is the process of decomposing organic matters and releases the nitrogen with the help of saprophytes and bacteria in the form of ammonia in the nitrogen cycle.
Thus, the correct answer is - nitrogen fixation and ammonification.
