* Closed system - Exchanges energy, but not matter, with its surroundings
* Closed system - Exchanges energy, but not matter, with its surroundings
* Open system - Exchanges both matter and energy with its surroundings
* Open system - Exchanges both matter and energy with its surroundings
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Note for those planning on arguing against [{Evolution]] by invoking the Second Law: Earth's environment is not a closed system, due to the immense amount of energy the [[Sun]] beams at us constantly.