Define Open System

An open system is a system that regularly exchanges feedback with its external environment.
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Define Open System
An open system exchanges matter and energy with its surroundigs.

For example: An Ecoststem.
Define closed system
A closed system exchanges energy but not matter. Stricktly, closed systems do not occur naturally on Earth, but all the global cycles of matter.

For example:
1.The "Biosphere II" experiment was an attempt to model this.
2. Water and nitrogen cycles, approximate to closed systems.
Define Isolated system
An isolated system exchanges neither matter nor energy. And no such system exist (with the possible exception of the entire cosmos).
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