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nitrogen cycle
chem.	cycle de l’azote
environ., chem.	cycle de l'azoté
life.sc., agric.	cycle de l'azote
nitrogen cycle The complex set of processes by which crops acquire the large amount of nitrogen they need to make proteins, nucleic acids and other biochemicals of which they are composed, and how the nitrogen returns to the atmosphere
environ.	cycle de l'azote

nitrogen cycle: 5 phrases in 3 subjects

Astronomy	2
Environment	2
Natural sciences	1