Natural variation in artificial selection is used because humans choose from among the naturally occurring variation s in species. Natural selection is related to species fitness because Darwin called natural selection survival of the fittest because those that could survive would carry their species on there for being the naturally selected.
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Artificial selection.Artificial selection is the selection, by humans, of which individual plants or animals to breed from. In this way desirable characteristics, such as increased yield or disease resistance, can be preserved or improved.Charles Darwin used artificial seletion as a model for how evolution could take place in nature, where competiton between individuals replaced the selective action of humans. He called the natural process 'natural selection'.See http://evolution.berkeley.edu/evosite/evo101/IIIE4Evochange.shtmlfor an excellent account.
NO. Both artificial and natural selection are forms of Evolution in general. Both cause variation by selection within a particular population. The only difference is who is doing the selection, humans or nature.
Maybe u should actually answer because i'm to tupid to know the answer/ The artificial selection although controlled by the choices of humans created novelty in the races. During natural selection the environment is responsible for selecting the best types. Darwin's ideas of natural selection were based on the fact of struggle for existence and survival of the fittest. Thus by artificial selection some of the races have been developed which can sustain the present environmental conditions. this has contributed to his ideas.
Natural selection seems to be the only selection that can drive speciation with powerful adaptive change. Sexual selection seems to stay within the species and both gene flow and genetic drift do not seem to drive speciation very well.
Adaptation does not allow for natural selection: natural selection causes adaptation.