Why don't we quote something with a little more substance (and accuracy)?
http://en.wikipedia.org/wiki/Natural_selection
Also:
http://en.wikipedia.org/wiki/Modern_evol..._synthesis
This "Modern Evolutionary Synthesis" is the current model that people usually refer to simply as "Theory of Evolution by Natural Selection".
So, if you want to get the current scientific understanding of how evolution works, this is what you should refer to.
It is a bit of a broad subject so it is understandable that quite a few people find it to be overwhelming.
http://en.wikipedia.org/wiki/Natural_selection
Quote:Natural selection is the gradual process by which biological traits become either more or less common in a population as a function of the effect of inherited traits on the differential reproductive success of organisms interacting with their environment. It is a key mechanism of evolution. The term "natural selection" was popularized by Charles Darwin who intended it to be compared with artificial selection, now more commonly referred to as selective breeding.
Also:
http://en.wikipedia.org/wiki/Modern_evol..._synthesis
Quote:The modern evolutionary synthesis is a 20th-century union of ideas from several biological specialties which provides a widely accepted account of evolution. It is also referred to as the new synthesis, the modern synthesis, the evolutionary synthesis, millennium synthesis or the neo-Darwinian synthesis.
The synthesis, produced between 1936 and 1947, reflects the consensus about how evolution proceeds.[1] The previous development of population genetics, between 1918 and 1932, was a stimulus, as it showed that Mendelian genetics was consistent with natural selection and gradual evolution. The synthesis is still, to a large extent, the current paradigm in evolutionary biology.[2]
The modern synthesis solved difficulties and confusions caused by the specialisation and poor communication between biologists in the early years of the 20th century. At its heart was the question of whether Mendelian genetics could be reconciled with gradual evolution by means of natural selection. A second issue was whether the broad-scale changes (macroevolution) seen by palaeontologists could be explained by changes seen in local populations (microevolution).
The synthesis included evidence from biologists, trained in genetics, who studied populations in the field and in the laboratory. These studies were crucial to evolutionary theory. The synthesis drew together ideas from several branches of biology which had become separated, particularly genetics, cytology, systematics, botany, morphology, ecology and paleontology.
[...]
The modern evolutionary synthesis continued to be developed and refined after the initial establishment in the 1930s and 1940s. The work of W. D. Hamilton, George C. Williams, John Maynard Smith and others led to the development of a gene-centered view of evolution in the 1960s. The synthesis as it exists now has extended the scope of the Darwinian idea of natural selection to include subsequent scientific discoveries and concepts unknown to Darwin, such as DNA and genetics, which allow rigorous, in many cases mathematical, analyses of phenomena such as kin selection, altruism, and speciation.
This "Modern Evolutionary Synthesis" is the current model that people usually refer to simply as "Theory of Evolution by Natural Selection".
So, if you want to get the current scientific understanding of how evolution works, this is what you should refer to.
It is a bit of a broad subject so it is understandable that quite a few people find it to be overwhelming.