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Systems never develop in a static environment; systems influence the environment and are contributory determinants in its development. An example of this is the reciprocal dependence of two biological species, prey and predator. This reciprocal dependence determines the conditions of evolution for both species.

Definition extracted with permission from Simon, Fritz, et al, Family Process, Inc.: Language of Family Therapy: A Systemic Vocabulary and Source Book (Family Process Press Series)

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