Evidence against “intelligent design” Example 1: The Recurrent Laryngeal Nerves.
The Recurrent Laryngeal Nerve (RLN) is a pair of nerves that decent from the brain, down the neck, and loop around the major aorta of the heart before making their way up to the larynx. If you were an all-knowing creator, would you “wire” your creations in such a needlessly complicated way? Why not just go right from the brain to the larynx?
But of course, there is no all-knowing creator, and the trail traveled by the RLN is the result of fish. “But Austin, what do fish have to do with anything?” You may be asking yourself. Well, all tetrapods are evolutionarily descended from fish, and in the anatomy of fish the route of the RLN makes sense. Fish don’t have much in the way of a neck, you see, so the RLN only must make a short jot around the aorta to get to the larynx. But over time, the proto-tetrapods began to gain a neck, and the RLN found itself “stuck” on the wrong side of the aorta as the head moved further from the torso. Now evolution had only one option available to it, since the RLN and aorta could not be “untied”, the RLN would have to be made longer.
So now, even in species as neck-y as Giraffes and Sauropods, the RLN must go all the way down to the aorta before heading back up to the larynx. If there was an all-knowing creator, surly he would have foreseen the complications of this sort of “wiring”. But evolution does not have the benefit of foresight, and the RLN shows that.