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Evolution is the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth In order for a organism to undergo evolution the organism must first encounter a change in the environment In the theory of evolution there are 6 steps that must occur in order for an organism to undergo evolution These 6 steps are evolution gradualism speciation common ancestry natural selection and nonselective mechanisms of evolutionary change These steps can be seen throughout history Fossils are one way that you can see evolution in an organism Showing common ancestry of two groups then does not require that we produce fossils of the precise single species that was their common ancestor or even species on the direct line of descent from an ancestor to descendant Rather we need only produce fossils having the types of traits that link two groups together and importantly we must also have the dating evidence showing that those fossils occur at the right time in the geological record A transitional species is not equivalent to an ancestral species it is simply a species showing a mixture of traits from organisms that lived both before and after it This shows that we can see common ancestry through fossils because you can see similar features through the fossils Also through fossils it is possible to see evolution gradualism and speciation Through fossils you can see the evolution of the organism over time you can see fossils from different time periods and see the gradual change in each time period and you can see the formation of a new species in fossilsVestiges is when a feature of a species that was an adaptation in its ancestors but that has either lost its usefulness completely or as in the ostrich has been co-opted for new uses It is vestigial not because its functionless but because it no longer performs the
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