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ecological balance
econ.	équilibre écologique
environ.	équilibre naturel
nat.res.	balance écologique
ecological balance The condition of equilibrium among the components of a natural community such that their relative numbers remain fairly constant and their ecosystem is stable. Gradual readjustments to the composition of a balanced community take place continually in response to natural ecological succession and to alterations in climatic and other influences
environ.	équilibre écologique

ecological balance: 5 phrases in 3 subjects

Environment	3
Life sciences	1
United Nations	1