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Definition: A nonrandom reproduction of varying organisms in a population that causes the survival of those best adapted to their environment and elimination of those less well adapted; leads to evolutionary change if the variation is heritable, accumulating the most favorable traits in the population and discarding less favorable ones.
Source: Hickman, C.P., et al. 2011. Integrated Principles of Zoology. Fifteenth Edition. McGraw-Hill Higher Education.