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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. The designer 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.