Have you have ever seen a house that was designed as it was built? Sort of a "we'll make that decision when we get to it" kind of attitude. These kinds of houses tend to have all sorts of compromises, stairwells placed inconveniently, windows at the wrongs heights unable to see through them, doors coming in on funny angles or opening the wrong way. These design flaws are smoothed over by ad hoc decisions to try and make the best of what is already there. This is quite contrary to a house that was built by design from scratch. Unless the designer overlooked these things, many of the problems aforementioned would not arise in a well designed house.
The same analogy can be applied to living organisms. If they had been designed from scratch, by a good designer you wouldn't expect to find inexplicable compromises. On the other hand, if an organism had evolved, making the best out of what was availiable with small changes over time design flaws and compromises are not a problem at all.
Nature has many examples of these inherent 'design flaws' which not only are no problem at all for evolution to explain, but in fact are strong evidence for evolution in themselves.
Here is a list of a few 'design flaws' found in modern animals.
-The Human eye has a blind spot due to very poor design.
-The recurrent laryngeal nerve backtracks and makes a loop around the Aortic arch, in the case of the giraffe this results in an extra 20 feet of nerve that is produced for no reason.
- The human jaw is too small for our teeth, hence why many people have problems with wisdom teeth.
-Useless wings on flightless birds.
-The existence of the pharynx, used for breathing and eating, often leading to choking.
There are many more we know about, and no doubt many many more we havn't discovered yet. These 'design flaws' are strong evidence that evolution has occurred, and are very problematic for people who propose that life was created by an 'intelligent designer'. Their 'designer' should be relabelled as the 'inept designer' or the 'unintelligent designer' instead.