Orthogenesis is an old thesis that is no longer accepted even by theory of evolution's own adherents. This thesis assumes that living things evolved not according to environmental conditions, but solely according to their own genetic structures.
According to the orthogenetic view, a kind of internal program leads living things to evolve in a particular way. This view also led to orthogenesis being known as the predetermination theory. This hypothesis, based on no scientific evidence whatsoever, lost all credence in the second half of the 20th century.
Every living thing has been created in accord with its habitat. In cold regions, such as the poles, living things are protected against the climate by their thick fur or feathers and layers of fat beneath their skin.