Trace organs are atrophied structures with no obvious function in the body.
O cecal appendix The human intestine, for example, is a vestigial organ. This organ is a small projection of the caecum (region of the large intestine) and plays no important role in man and carnivorous animals.
In herbivores, however, the appendix is very developed and plays an important role in cellulose digestion; in it live microorganisms that act on the digestion of this substance.
It seems that the present mammals, carnivores and herbivores, had common ancestors whose diet should be based on plant foods rich in cellulose. However, in the course of evolution, caeca and appendages are no longer beneficial to some groups of organisms, in which they are reduced, as traces of their origin.
Examples of vestigial structures are the coccygeal vertebra, the nictitating membrane and the muscles of the ears.
Do Men Descend From Monkeys?
One of the arguments used to defend evolutionism is that of Comparative Anatomy. In the following image we can verify the existence of homologous organs (organs that have the same origin, the same basic structure and identical position in the organism and may perform different functions) between man and another primate.