The most important point being that the natural balance in an ecosystem is maintained.This balance may be disturbed due to the introduction of new species, the sudden death of some species, natural hazards or man-madeĀ 
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Let various carnivorous into the forest and they will kill some of the rabbits or plantation of more trees should be done so that the loss may be fullfilled

Actually the thing is this all are natural things so we should not interfere with it.
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