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ciclo del nitrógeno
chem.	nitrogen cycle (en la naturaleza)
environ.	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
life.sc., agric.	nitrogen cycle

ciclo del nitrógeno : 3 phrases in 2 subjects

Environment	2
Natural sciences	1