The global ecosystem is made up of an ensemble of interacting local and regional ecosystems, each composed of biotic and abiotic subsystems. The evolution of these systems is constrained by physical and system laws and by the basic properties of their environment, including the constraints of exergy (energy that can be usefully transformed into work), material, and information flows. Sustainability (persistence) of a system in its environment therefore requires respecting these constraints. Conversely, the very fact of its persistence demonstrates that a system has successfully adapted to its operating conditions. Evolution has forced it to respect physical and system laws and the basic properties of its environment. To an observer, the system's behavior appears to be guided by a particular attractor state, or by attention to a number of orientors.

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10 Ways To Fight Off Cancer

10 Ways To Fight Off Cancer

Learning About 10 Ways Fight Off Cancer Can Have Amazing Benefits For Your Life The Best Tips On How To Keep This Killer At Bay Discovering that you or a loved one has cancer can be utterly terrifying. All the same, once you comprehend the causes of cancer and learn how to reverse those causes, you or your loved one may have more than a fighting chance of beating out cancer.

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