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species A group of similar organisms that can mate with each other and produce offspring that can also mate and reproduce.
fossil The preserved remains or traces of an organism that lived in the past.
adaptation A trait that helps an organism survive and reproduce.
evolution The gradual change in a species over time.
scientific theory A well-tested concept that explains a wide range of observations.
natural selection The process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species.
variation Any difference between individuals of the same species.
Created by: twilights
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