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In geology, catastrophism is the theory that the Earth has largely been shaped by sudden, short-lived, violent events, possibly worldwide in scope. [1] This contrasts with uniformitarianism (sometimes called gradualism ), according to which slow incremental changes, such as erosion , brought about all the Earth's geological features.
Evolution is the change in the heritable characteristics of biological populations over successive generations. [1] [2] It occurs when evolutionary processes such as natural selection and genetic drift act on genetic variation, resulting in certain characteristics becoming more or less common within a population over successive generations. [3]
Thus, the outcome of natural resource management's "evolution" over the course of the 20th century is ecosystem management, which explicitly recognizes that technical and scientific knowledge, though necessary in all approaches to natural resource management, are insufficient in themselves.
[9] [10] The lower Cambrian had a burst of apparently rapid evolution, called the "Cambrian explosion". One of the many hypotheses for "causes" of the Cambrian explosion is the "Light Switch" theory of Andrew Parker: it holds that the evolution of advanced eyes started an arms race that accelerated evolution. [11]
The theories could be updated, however, by considering new reports, which Robert Ranulph Marett (1866–1943) did for Tylor's theory of the evolution of religion. Field workers deliberately sent out by universities and other institutions to collect specific cultural data made available a much greater database than random reports.
Unilineal evolution, also referred to as classical social evolution, is a 19th-century social theory about the evolution of societies and cultures. It was composed of many competing theories by various anthropologists and sociologists, who believed that Western culture is the contemporary pinnacle of social evolution. Different social status is ...
Cultural evolution is an evolutionary theory of social change.It follows from the definition of culture as "information capable of affecting individuals' behavior that they acquire from other members of their species through teaching, imitation and other forms of social transmission". [1]
Evolution provides the field of biology with a solid scientific base. The significance of evolutionary theory is summarised by Theodosius Dobzhansky as "nothing in biology makes sense except in the light of evolution." [78] [79] Nevertheless, the theory of evolution is not static. There is much discussion within the scientific community ...