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 proposed pangenesis theory to complement his 1859 theory of evolution via natural selection. Darwin coined the term pangenesis, with pan- meaning whole, and genesis indicating origin. With the term pangenesis, Darwin suggested that all parts of the parents could contribute to the evolution and development of the offspring.