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This is the idea that there is some last universal common ancestor, from which all plants, animals, fungi, and other life on Earth are directly descended.
This is the idea that there is some last universal common ancestor, from which all plants, animals, fungi, and other life on Earth are directly descended.
Webster's dictionary put it as, "...the development of a species, organism, or organ from its original or primitive state to its present or specialized state; phylogeny or ontogeny"<ref>Quoted in [http://www.talkorigins.org/faqs/evolution-definition.html What is Evolution], by Laurence Moran.</ref>
Webster's dictionary put it as, "...the development of a species, organism, or organ from its original or primitive state to its present or specialized state; phylogeny or ontogeny"<ref Name="TO">Quoted in [http://www.talkorigins.org/faqs/evolution-definition.html What is Evolution], by Laurence Moran.</ref>
Although it has been criticised on a number of grounds<ref>Laurence Moran on Talk.Origins criticises the definition for excluding prokaryotes, protozoa, and fungi, and for specifying ''gradual'' changes, and other reasons.</ref>, this is the main concept behind the definition provided by the Oxford Concise Science Dictionary: "The gradual process by which the present diversity of plant and animal life arose from the earliest and most primitive organisms, which is believed to have been continuing for the past 3000 million years".<ref name="TO" />
'''Descent with modification'''
'''Change in gene frequency'''
E.O. Wilson defines, "evolution is any change in gene frequency in a population." This is narrower than the first definition because it just includes biological change, and only those changes which are inherited.
E.O. Wilson defines evolution as "any change in gene frequency in a population." Helena Curtis and N. Sue Barnes define evolution as "any change in the frequency of alleles within a gene pool from one generation to the next"<ref Name="TO" />
== Use of different definitions ==
== Use of different definitions ==