Evolution, process by which modern organisms have changed over time, Fossils, The preserved remains or traces of organisms that once lived on Earth., artificial selection/selective breeding, process by which humans breed animals and plants for a desired set of particular traits, Adaptation, inherited characteristic that increases an organism's chance of survival, Fitness, Ability of an organism to survive and reproduce in its environment, Biogeography, study of the distribution of organisms around the world, homologous structures, similar structures that related species have inherited from a common ancestor, analogous structures, structures that do not have a common evolutionary origin but are similar in function, vestigial structures, remnant of a structure that may have had an important function in a species' ancestors, but has no clear function in the modern species., natural selection, A natural process resulting in the evolution of organisms best adapted to the environment..

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