* 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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Many Creationists claim that the Second Law of Thermodynamics disproves evolution.<ref>http://www.trueorigin.org/steiger.asp</ref> Evolutionists deny this claim stating that the earth is not an isolated system because energy is pumped in from the sun. However, the universe as a whole is an isolated system. An isolated system never exchanges matter or energy with its surroundings. It is impossible for the total entropy of an isolated system to decrease, therefore the universe is becoming more and more disordered. In this way the Second Law of Thermodynamics disproves evolution.