Devolution, de-evolution, or backward evolution is the notion that a species can change into a more "primitive" form over time. Devolution presumes that there is a preferred hierarchy of structure and function, and that evolution must mean "progress" to "more advanced" organisms. This may include the idea that some modern species that have lost functions or complexity accordingly must be degenerate forms of their ancestors. However, according to the definition of evolution, and particularly of the modern evolutionary synthesis in which natural selection leads to evolutionary adaptation, phenomena represented as instances of devolution are in every sense evolutionary.
Other articles related to "devolution":
... Devolution, the verb "devolve" and the past participle "devolved" are all common terms in science fiction for changes over time in populations of living things ... However, "devolution in practice typically refers to changes that occur from a problem no longer existing rather than superior solutions existing ...