Rath on 08 September 2011
Under the theory of evolution the most significant changes come from sexual or environmental changes. If neither of these change for a species over the course of many millions of years then no significant change is expected to happen. Genetic drift does not strongly effect large populations of animals so a population which has remained consistently large over a long period of time with little environmental or sexual pressure will not necessarily evolve in a significant or visible manner.
Living fossils do not disprove evolution.
