We should not always assume that every human development has an adaptive explanation. Because of the complexity of evolution, the human body still sustains a few reminisce of our ancient lives. Here are some useless human body parts that serve very little or no purpose in our survival.
When primitive humans were largely food gatherers vegetarians, the appendix helped in the digestion of food. Located in a pouch like structure between large and the small intestine, the appendix basically assisted the latter in digesting cellulose and possibly also produced white blood cells. Though lying dormant, the appendix can causes a host of problems like it can get infected causing appendicitis – an inflammation of the appendix. It causes abdominal pain, decreased appetite, nausea etc but most of the time people don’t have the symptoms.