Evolution, process of change over time, Occurs to populations NOT INDIVIDUALS, Natural Selection, An organism's traits/ adaptations making it better suited to survive, reproduce, and pass on those traits., Fitness, Organism’s reproductive success, Homologous Structure, Same structure with same function that shows a common ancestor., Analogous Structure, Different structure, same function. EX: Bird wing and butterfly wing, Vestigial Structure, Structures that no longer serve a purpose EX: Whale hips, Adaptations, inherited trait with a functional role in an organism., Population, all the organisms of the same species living within a particular area, Bottleneck effect, Population size is decreased drastically causes decrease in genetic diversity., Gradualism, Type of evolution that is slow and constant., Gene Pool, All the available genes in a population., Gene Flow, The transfer of genes between different populations.

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