1. ammonification
2. assimilation
3. denitrification
process by which green plants
convert carbon dioxide, water, and
energy from the sun into sugars
process by which certain bacteria in
the soil convert nitrogen gas into
ammonia and ammonium
process by which certain bacteria
convert organic nitrogen into ammonia
and ammonium salts during
decomposition
process by which living cells
produce usable energy from food
process by which certain bacteria
convert ammonium into nitrates
process by which certain bacteria
convert nitrates into nitrogen gas
process by which plants or animals
convert nutrients into usable organic
compounds, such as proteins
4. nitrification
5. nitrogen fixation
6. photosynthesis
7. respiration