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.
A.Darwin thought that organisms could induce their own changes, while Lamarck thought that change could only be induced by an organismâs environment. B.Darwin thought that change could occur in ... biology what is the process by which organisms maintain a relatively stable internal environment?