Evolution, Change over time, Species, A group of organisms that can produce offspring with one another, Fossil, Preserved remains of ancient organisms, Variation, Differences between members of the same species, Adaptation, Any trait that gives an organism an advantage that enables it to survive and reproduce, Population, A group of organisms that belong to the same species, Fitness, The ability of organisms to survive AND reproduce, Homologous Structures, “Same but different”. Like the bones in a dolphin’s flipper and a monkey's arm, Analogous Structures, “Different but the same” Like wings in a butterfly and a bird. Do the same thing but built very differently., Vestigial Structures, Structures still present in an organism but no longer needed. Appendix in humans, pelvis in whales., Genetic Drift, Change in the frequency of an existing gene in a population due to chance. A natural disaster can cause this. , Gene Flow, A transfer of genetic material from one population to another., Mutation, A change in the DNA sequence, Speciation, A group of organism is separated from others of its species and over time develops new characteristics that lead to it becoming a new species. , Convergent Evolution, Organisms that are not closely related develop similar features as solutions to similar problems. Body shape of sharks and dolphins. , Divergent Evolution, Two groups of the same species become separated and develop different characteristics for different environment conditions. , Extinction, All members of a species have died..

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