When mutations occur in an organism's DNA, they are well conserved because they facilitate survival, a process known as "natural selection" . Therefore, natural selection is basically the form of Darwin's theory of evolution, which acts to preserve genetic mutations. Natural selection is also similar to evolution because it advocates a benefit that allows a species to strive and survive better in the wild. Some argue that evolution and natural selection are different because they believe that evolution is the method by which new types of species arise. Whereas natural selection is the “mechanism” by which evolution occurs with varieties in populations that could be eliminated based on their ability to survive. In the video Expelled: No Intelligence Allowed, according to a scientist, "evolution is just a