Vestigial Organs and Immune System

Many of us have taken classes in biology in which we were told that one of the arguments for Darwinian evolution is the presence of vestigial organs. New research questions whether vestigial organs are evidence of evolution or evidence of design.

The argument for the appendix being vestigial was that this fingerlike projection on our colons was a second stomach in earlier stages of evolution. The theory was that since we now cook our food, there is no need for the appendix and it has become useless. The same was said of the tonsils, adenoids, and gall bladder, so they could be removed with no consequences. I can tell you from personal experience that having these three items removed from your body does have negative implications for your general health.

Scientific American (March 2019, page 20) published a report of a 2017 study by an evolutionary biologist named Heather Smith. She is the director of the Anatomical Laboratories at Midwestern University in Arizona. Her study questions whether those organs are really vestigial. She examined 533 species of mammals and found that there is an immunological and gastrointestinal purpose for the appendix. The appendix contains a layer of gut bacteria that are important in fighting disease. Like the tonsils and adenoids, the appendix serves a vital role in defense of our bodies against infection.

It seems that the evolutionary explanation of the use of these organs is not totally correct. While things like wisdom teeth may be examples of vestigial organs; tonsils, adenoids the appendix and the gall bladder are not. The design of the human body is so complex that science is still trying to figure out all of the design features that enable us to survive.

–John N. Clayton © 2019