A variance is an exception to one or more of the zoning restrictions on a piece of property. A variance is different from a nonconforming use, which permits existing structures and uses to continue when zoning is first instituted.
The book, On The Origin Of Species,  suggested  that organisms evolve through the process of natural selection.opulations evolve as the individual organisms less able to survive in the current environment die and fail to reproduce. That is natural selection.
Natural selection is a principle that was first proposed by Charles Darwin and Alfred Russel Wallace. The two biologists noted that organisms which were better adapted to their environment tended to survive longer. Better adapted organisms also tend to reproduce more than less well-adapted organisms.atural selection is a principle that was first proposed by Charles Darwin and Alfred Russel Wallace. The two biologists noted that organisms which were better adapted to their environment tended to survive longer. Better adapted organisms also tend to reproduce more than less well-adapted organisms.