Evolution - Process by which organisms change over time, Geographic Isolation - Geographic barrier separates two populations, Fossils - Remains of organisms from long ago., Naturalist - A person who studies nature by observing plants and animals, Population - A species living in one area, Gene pool - Collection for all the genes and traits in a population, Speciation - When two new species are created from one species, Variations - The differences among organisms, Mutation - A change in the structure of a gene or chromosome, Migration - Movement of a species out of a population, Natural Selection - A process where organisms with certain traits have a better chance to survive and reproduce,

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