N2 in air

1
Nitrogen Cycle
N2 in air
Lightning
N2 Fixing
Denitrification
Nitrates
Nitrification
Assimilation
Nitrites
Nitrification
Plant Proteins
Decomposition
Eaten
Ammonium Compounds
Decomposition
Animal Proteins
2
Carbon Cycle
Carbon Dioxide in air
Respiration by micro-organisms
photosynthesis
Respiration
Respiration
Combustion
Eaten
Plant Carbohydrate
Animal Carbohydrate
Fossil Fuels
Death and Decay
Death and Decay
Dead Organic Matter