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The Theory of Evolution The theory of evolution is based on the fact that certain traits are passed on more often than others. These characteristics make it easier for individuals to live and reproduce and thus increase in number over time. Scientists now understand how this process is carried out. For instance an examination of the clawed frog showed that duplicate genes frequently result in different functions. Evolution is an inevitable process Natural selection is the process that results in organisms changing to be better at adapting to the environment they