Intelligent Design is one of those creationist terms used to describe how earth's life came about. Not through the hit-and-miss process of evolution, but "by the deliberate hand of god." God being the intelligent designer. But just how intelligent were these designs? Could they have been better? My guess is that the creationist will say, "
No. Being designed by god, by default they're perfect." In contrast, unintelligent design would be something not created by god, and would more likely than not have flaws, glitches, and deficiencies of some sort. Flaws, glitches, and deficiencies that that may even be detrimental. So, are there any such less than perfect designs; traits that point away from an intelligent designer?
Having stumbled across an article in Wikipedia, I believe there are. The article points out four such examples in humans. Although it was written to describe traits inherited through natural selection that are detrimental to the organism, it also functions as an argument against intelligent design and an intelligent designer. If you're going to insist that god did it all then you have to admit he could have done a better job.
Eyes
One example in humans of unintelligent design is the eyes. The eyes perceive images by receiving light in the retina. The retina sends electrical signals to the brain through the optic nerve and people see images. The optic nerve, however, is connected to the retina on the side that receives light, essentially blocking a portion of the eye and giving humans a blind spot.[1] A better structure for the eye would be to have the optic nerve connected to the side of the retina that does not receive the light, such as in cephalopods.[2]
Throat
Another example in humans is the throat. The esophagus, the part of the throat that allows food to travel to the digestive tract, is connected to the pharynx and the larynx, the parts of the throat that allow humans to breathe and talk.[3] Because these parts are connected, choking can become a major issue. Food and other objects can sometimes get stuck in the throat blocking the air flow and not allowing much needed oxygen to enter the lungs and the rest of the body.[4] If the parts were not connected and did not share a portion of their travel paths, choking would not be an issue, as it isn’t for most other animals in the world.
Teeth
The teeth present a third example in humans alone of unintelligent design. When human beings first started developing larger brains, they had to evolve larger skulls to be able to store the larger brain. Evolution caused the skull cavity to become larger by adding bone from the jaw. In essence, the jaw became smaller to support a larger brain, but the teeth that were in the jaw did not become smaller in size.[5] The amount of teeth that used to fit in the human mouth no longer fits. Because humans generally don’t have room for all 32 teeth, problems arise when all 32 teeth grow in. Wisdom teeth are generally the most problematic due a smaller jaw size. Wisdom teeth, when growing into a jaw that no longer has room, can damage neighboring teeth or even cause serious infections of the mouth.[6] If the human jaw was larger in size there would be plenty of room inside the mouth for all 32 teeth to be present at the same time and the problems that are persistent with wisdom teeth would be less of a threat.
Spinal cord
Another issue that evolved from having a larger brain is that parts of the human body cannot heal properly. The spinal cord, for instance, cannot ever properly heal if it is damaged. Because neurons have become so specialized through evolution, they are no longer able to regrow once they reach their mature state. If the spinal cord is injured, even slightly bruised, the neurons cannot repair themselves like other body cells can. The spinal cord, if broken, will never repair itself and will result in permanent paralysis. If neuron cells had not become so specialized in the spinal cord, then they would be able to repair themselves after an injury.[7]
Link
For more examples of unintelligent design see
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