On The Human Tail
(and other rudimentary organs)
2012 By Dale Bryant
The human embryo is indistinguishable from any other vertebrate animal (animals possessing a spinal column, or, notochord with extended extremities, e.g., arms, legs, etc.) This is due to the law of phylogenesis, which covers a period of many millions of years of vertebrate evolutionary development. Another law, the law of ontogenesis, explains the brief period of development from conception to birth.
The embryos of all vertebrates, including us, exhibit our entire evolutionary development, starting out with the fishes, extending to the amphibious vertebrates, then on to reptiles and eventually birds and mammals. Our entire developmental sequence over millions of years is apparent. The human, dog, fish, chimpanzee, tortoise, whale and all other vertebrate embryos have gills, legs (yes, even whales), and tails as well as other rudimentary organs which, in the case of the mammals have been abbreviated or aborted. Humans still possess a short tail, consisting of four to five fused vertebrae at the end of the spinal column, called the coccyx (kok-six).
This, of course, suggests that all extant life forms (99% of all life that has ever existed is now extinct), developed or evolved from a common ancestor in the remote past and that Man was not instantly placed here on this planet, in his present, "unchanging" form by a Creator with a definite plan outside of mechanical causes. This is a very sensitive issue for those who subscribe to a dualistic approach to creation, and those averse to changing previously accepted thinking. I do feel for you as I was once one of you, but then I transferred my interests from professional astronomy to paleoprimatology and saw for the first time the very obvious.
I can recommend a good book by Ersnt August Haekel titled “The History of Creation” available free online at Google Books. Do it!