Evolution of a Chicken
The theory of evolution is one of the greatest intellectual revolutions of in human history, changing our perception of the world forever. Charles Darwin put forward the theory of evolution and a great body of evidence to support his theory. In Darwin's time, most scientists believed that each organism’s adaptations was the work of the creator. Carl Linnaeus, a Swedish botanist, zoologist and physician, established the system of biological classification that we use today. In other words, all of the similarities and dissimilarities in groups of organisms that are the result of the branching process creating the tree of life were viewed by early 19th century philosophers and scientists as a consequence of all-powerful design. Evolution is the change in the heritable characteristics of biological populations over millions of years. Evolutionary processes give rise to biodiversity at every level of biological organisation, including the levels of species, individual organisms, and molecules.
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Evolution by natural selection is a process first demonstrated by the observation that often, more offspring are produced than can possibly survive. Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations. Charles Darwin popularised the term "natural selection", contrasting it with artificial selection, which is intentional, whereas natural selection is not. There is a rich amount of evidence that supports Darwin’s theory, for example the peppered