Final answer:
Explanation of key processes in the nitrogen cycle: nitrogen fixation, assimilation, ammonification, and denitrification.
Explanation:
Nitrogen fixation: The process by which nitrogen gas (N2) is converted into ammonia (NH3) by nitrogen-fixing bacteria, making nitrogen available for use by plants and other organisms.
Nitrogen assimilation: The incorporation of nitrogen into organic compounds by plants and other organisms through the uptake of nitrates from the soil.
Ammonification: The process where decomposers convert organic nitrogen into ammonia, releasing it back into the soil.
Denitrification: The conversion of nitrates in the soil back into atmospheric nitrogen gas by denitrifying bacteria, completing the nitrogen cycle.
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