A group of similar organisms that can mate with each other and produce offspring that can also mate and reproduce, Species, Change over time; the process by which organisms have descended from ancient organisms, Evolution, The preserved remains or traces of an organism that lived in the past, Fossil, An inherited behavior or physical characteristic that helps an organism survive and reproduce in its environment, Adaptation, A well-tested explanation for a wide range of observations or experimental results, Scientific Theory, The process by which organisms that are best adapted to their environment are most likely to survive and reproduce, Natural Selection, the struggle between organisms to survive as they attempt to use the same limited resources in the same place at the same time, Competition, The process by which two species evolve in response to changes in each other over time, Coevolution, All the fossils that have been discovered and what scientists have learned from them, Fossil record, Structures that are similar in different species and that have been inherited from a common ancestor, Homologous structure, Term used to describe a group of related organisms that has died out has no living members, Extinct.

Evolution

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