Ecology is the science of the study of ecosystems. Ecological balance has been defined by various online dictionaries as "a state of dynamic equilibrium within a community of organisms in which genetic, species and ecosystem diversity remain relatively stable, subject to gradual changes through natural succession." and "A stable balance in the numbers of each species in an ecosystem
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The main  problem related to ecological imbalance is cutting of trees and hunting of animals by some greedy hunters.
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