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.
Darwin's Theory of Evolution: Did Man Really Evolve from Apes? Charles Darwins theories on evolution upended the scientific community in the middle of the 19th century. He proposed that small changes over billions of years created the species we have today. Darwin felt that it was a survival of the fittest.