Charles Darwin, British naturalist who formulated the theory of evolution by natural selection., Diversity, The variety of organisms that inhabit the Earth., Evolution, the gradual change in species over time, Variation, Any difference between organisms of the same species., Adaptation, behavior or physical characteristic that allows an organism to survive and reproduce in its environment, Mutation, Any change in the DNA of an organism., Natural Selection, A process by which individuals that are better adapted to their environment are more likely to survive and reproduce than others that are not, Extinction, The disappearance of all members of a species from Earth., Fossils, The preserved remains or traces of an organism that lived in the past., "Missing Links", Gaps in the fossil record., Homologous Structure, Similar structures that related species have inherited from a common ancestor, Radioactive Dating, Process where scientists look at the half-life of chemicals contained in rocks around a fossil to determine the age of that fossil..

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