The Forum > General Discussion > Evolution is not a scientific theory
Evolution is not a scientific theory
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Claim:
Some biochemical systems are irreducibly complex, meaning that the removal of any one part of the system destroys the system's function. Irreducible complexity rules out the possibility of a system having evolved, so it must be designed.
Response:
1. Irreducible complexity can evolve. It is defined as a system that loses its function if any one part is removed, so it only indicates that the system did not evolve by the addition of single parts with no change in function. That still leaves several evolutionary mechanisms:
• deletion of parts
• addition of multiple parts; for example, duplication of much or all of the system
• change of function
• addition of a second function to a part
• gradual modification of parts
All of these mechanisms have been observed in genetic mutations. In particular, deletions and gene duplications are fairly common, and together they make irreducible complexity not only possible but expected. In fact, it was predicted by Nobel-prize-winning geneticist Hermann Muller almost a century ago. Muller referred to it as interlocking complexity.
Evolutionary origins of some irreducibly complex systems have been described in some detail. For example, the evolution of the Krebs citric acid cycle has been well studied; irreducibility is no obstacle to its formation.
2. Even if irreducible complexity did prohibit Darwinian evolution, the conclusion of design does not follow. Other processes might have produced it. Irreducible complexity is an example of a failed argument from incredulity.
3. Irreducible complexity is poorly defined. It is defined in terms of parts, but it is far from obvious what a "part" is. Logically, the parts should be individual atoms, because they are the level of organization that does not get subdivided further in biochemistry, and they are the smallest level that biochemists consider in their analysis. Behe, however, considered sets of molecules to be individual parts, and he gave no indication of how he made his determinations.
ref: www.talkorigins.org