One of the most distinctive features of the fossil record is how living things remain unchanged during the geological periods in which they are discovered. A species preserves the structure it had when it first appears in the fossil record, until it either becomes extinct or else survives unchanged, over the course of tens or even hundreds of millions of years, to the present day. The meaning of this is clear: Living things did not undergo any process of evolution. God creates all living things together with the characteristics they possess. One of the organisms that has survived unaltered for millions of years is the fungus gnat. There is no difference between this 45-million-year-old fungus gnat pictured and specimens living today.