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An example of an argument for Intelligent Design: look at the eye. It has a lens, a receptor. No random mutation would produce both of these at the same time as they are far to complex for that. Yet they cannot have evolved seperately as their is no selective pressure for evolving one part without the other. Therefore, God must have made the eye develop one mutation at a time knowing what the end product would look like for it to exist.
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This is an example of what ID proponents call
"irreducable complexity", which is widely regarded as being fallacious pseudoscience. Dawkins addresses this topic extensively in
The God Delusion.
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The eye is a famous example of a supposedly irreducibly complex structure, due to its many elaborate and interlocking parts, seemingly all dependent upon one another. It is frequently cited by intelligent design and creationism advocates as an example of irreducible complexity. Behe used the "development of the eye problem" as evidence for intelligent design in Darwin's Black Box. Although Behe acknowledged that the evolution of the larger anatomical features of the eye have been well-explained, he claimed that the complexity of the minute biochemical reactions required at a molecular level for light sensitivity still defies explanation. Creationist Jonathan Sarfati has described the eye as evolutionary biologists' "greatest challenge as an example of superb 'irreducible complexity' in God's creation", specifically pointing to the supposed "vast complexity" required for transparency.
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