Scientifically, Darwin" s time was an extremely primitive period. Scientists knew little about living creatures" anatomy, and had no idea about genetics. According to them, cell was simply a small balloon filled with some jelly. As discoveries of genetic and anatomic features of living organisms came one after another, the theory of evolution proposed in such a time of ignorance has been rendered untenable. Paleontology, which reveals the unchanging nature of living beings" structures, has posed another threat to the theory of evolution. The fact that living organisms" complex structures have never changed once again shows that Almighty God created all living beings. This 50-million-year-old elm leaf fossil suggests as much.