Natural Selection, Charles Darwin's Theory that well adapted organisms survive and reproduce, Evolution, Slow change over time, Population, All members of the same species in one area, Speciation, When a species evolves into a new species, Naturalist, A scientist who studies living organisms, Geographic Isolation, When a new species evolves when areas become separated, Mutation, A random alteration of the DNA or gene code, Gene Pools, All the coded genes included in a population , fossils, Organisms preserved in sedimentary rock, variation, The many different traits that occur in the offspring, Acquired characteristics, Lamarck's Theory that a trait can be had in a single generation, Gradualism, The theory that evolution occurs slowly over time, Punctuated Equillibrium, The Theory that evolution occurs abruptly over a short period of time, Migration, When a member of a population travels away from the population, Reproductive Isolation, A condition where members of a population can not mate.

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