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My immediate response to this question is that the pattern and stability we see is a result of life. I think it relates to the evolutionary theory of survival of the fittest in that when a species develops and evolves, it tries different ways of doing things. The animals or plants that "discover" the most efficient ways of doing something such as reproducing, finding food, and migrating will be the ones who are ultimately the most successful. They will probably live longer and pass on their genes, creating a pattern of actions and therefore stability within that species' community.