Irreducible mechanisms
Darwin made one statement that has rebounded on him. He talked about irreducible mechanisms and that their presence would undermine his beliefs in evolution. This is because irreducible mechanisms cannot evolve because it requires multiple components which are dependent upon each other in order to exist.
How could evolution blindly evolve a mechanism which has no function without the presence of a second mechanism which interacts with the first mechanism to perform a function?
Behe defined irreducible mechanisms as 'An irreducibly complex evolutionary pathway is one that contains one or more unselected steps (that is, one or more necessary-but-unselected mutations). The degree of irreducible complexity is the number of unselected steps in the pathway'.
William Dembski gave the following definition: 'A system performing a given basic function is irreducibly complex if it includes a set of well-matched, mutually interacting, nonarbitrarily individuated parts such that each part in the set is indispensable to maintaining the system's basic, and therefore original, function. The set of these indispensable parts is known as the irreducible core of the system'.
The evolutionists look for similar components elsewhere in the body as a defence against irreducible mechanisms but I don't see the presence of similar mechanisms as being a defence. One has to query how/why there are mechanisms in those places where they are needed and not just all throughout the body.
The mouse trap is the classic example given as an irreducible mechanism. Could the evolutionary process allow the components of an irriducible mechanism to develop over time? If all the parts do not work together then the device is useless.
Other mechanisms within the human body include the blood clotting mechanism (coagulation cascade), the eyeball nd interpretation of sight, the brain mechanisms including the balance, logical thought, languages, etc.
Why would evolution allow components to develop that had no function to fulfil? If these components evolved over time and only became useful when they had all come together by pure random chance, then the body should be full of useless bits which are all developing over time under their own steam!
If components, similar to others or not, only developed because there was a need for them then we must question where that need comes from!
The fact that the body is not full of useless components and appendages shows that the evolutionary process only allows the development of components that will become useful in future generations. But that would infer that the human body is able to understand what is going to be needed in the future!