On page 141, Coyne explains how complex organs like the eye would have been created over the course of time by giving a series of examples with intermediary steps of said organ as can be found on animals today. But how could natural selection ever dictate that a blood vessel as crucial to the proper functioning of the body like the carotid artery would be placed so close to the surface of the skin, exposed and in great risk of being accidentally cut? This is just one example, another being the spinal column. It is illogical to think that such an important part of the nervous system would be surrounded by vertebrae and gelatinous discs that with one false move can sever the spinal cord and majorly disable a person. What other illogical body parts exist on humans that are either too vulnerable or exposed for natural selection to warrant their placements? On other animals? And how can evolution explain these simple vulnerabilities?