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.
The theory of evolution by natural selection that was developed by Charles Darwin revolutionized the study of living things. In his Origin of Species (1859) he provided a scientific explanation of how the diverse species of plants and animals have descended over time from common ancestors.