There is a theory about what scientists say that there is vestiges in people that prove the theory of evolution. These vestiges are supposed to be human body parts that are no longer needed, and are just castoffs from some earlier creature that we descended from. Because earlier creatures needed them and we do not. Evolutionists argue that these organs which still exist have no function, but were useful in less evolved animals. They call them vestigial organs.
A vestigial organ, by evolutionary definition, is an organ that was once useful during a previous stage of your evolution; but, in the course of time, that organ that was no longer needed and continued to remain in the body. To say it differently, changes in physical structure rendered certain organs redundant, but they still remain in the body.
What are these useless organs that we are supposed to have within us? Here are some of these supposedly useless organs in your body:
(1). Tonsils : This is not a useless organ because they have discovered that these two small glands in the back of your throat help protect you against infections.
(2). Appendix : Science recently discovered that man needs this organ; it is not useless after all. It helps protect you from gastrointestinal problems in the lower ascending colon. The appendix is now known to be an important part of what is called "reliculo- endothelial system" of the body. Like tonsils, the appendix fights infections.
(3). Coccyx: This organ also called coccygeal vertebrae is the bottom of your spine. Scientists have found that important muscles (the levatorani and coccygeus) attach to these bones. Without these muscles, your pelvic organs would collapse; that is fall down. Without them you could not have a bowel movement, nor could you walk or sit upright.
(4). Thymus : Try cutting this one out, and you will be in big trouble! It was once considered a worthless vestigial structure, but scientists have discovered that the thymus is the primary central gland of the lymphatic system. Without it, T cells that protect your body from infection could not function properly, for they develop within it. We hear much these days about the body's immune system, but without the thymus you would have none.
(5). Pineal Gland : This is a cone-shaped structure in the brain, which secretes critically needed hormones, including, for example, melatonin which inhibits secretion of luteinizing hormone.
(6). Pituitary Gland : Once claimed to be vestigial, this organ is now known to ensure proper growth of the skeleton and proper functioning of the thyroid, adrenal, and reproductive glands. Improper functioning can lead to Cushing's Syndrome (gigantism).
(7). Thyroid Gland : Many years ago doctors believed you could live after having your thyroid removed. But this ignorance breeds contempt. The thyroid glands secretes the hormone, "thyroxin", which goes directly into the blood. This hormone is essential to normal body growth in infancy and childhood. Without it, an adult becomes sluggish. Either an oversupply or an under supply of thyroxin will result in over-activity or under-activity of many body organs. Deficiency of this organ at birth causes a hideous deformity known as "cretinism". Thyroxin triggers cell batteries (mitochondria) to provide energy to the cell for all its functions.
(8). Semilunar Fold of the Eye: Charles Darwin and others after him have claimed that the little fold in the inner corner of your eye is a vestige of your bird ancestor! But contemporary anatomy books describe it, not as a vestige, but as a very necessary part of your eye. It is that portion of your conjunctiva that cleanses and lubricates your eyeball.
These organs that they called vestiges are actually organs that are necessary for your well being. God gave us these organs for a reason and that is what makes us "fearfully and wonderfully made". "I will praise thee: for I am fearfully and wonderfully made: marvellous are thy works: and that my soul knoweth right well". (Psalm 139:14)(KJV).