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'''Irreducible complexity''' is a property of any system whose internal workings are so complex that the removal or alteration of any part would prevent the system from functioning. For example, a car will not go without an engine. Indeed, the engine will not run without fuel and a starter motor. Designers must ensure that all parts work together to produce the intended function.

'''Irreducible complexity''' is a property of any system whose internal workings are so complex that the removal or alteration of any part would prevent the system from functioning. For example, a car will not go without an engine. Indeed, the engine will not run without fuel and a starter motor. Designers must ensure that all parts work together to produce the intended function.

This concept has been used by astronomer [[Fred Hoyle]] and biochemistry professor [[Michael Behe]] to argue against the idea of [[evolution through natural selection]]. A biological system could not make a gradual transition via small successive steps, unless each step provided an advantage to the species.  

This concept has been used by astronomer [[Fred Hoyle]] and biochemistry professor [[Michael Behe]] to argue against the idea of "[[evolution through natural selection]]". A biological system could not make a gradual transition via small successive steps, unless each step provided an advantage to the species.  

Behe presents several examples of organs and cells which could not have evolved through natural forces alone due to their irreducible complexity.  

Behe presents several examples of organs and cells which could not have evolved through natural forces alone due to their irreducible complexity.