The theory of evolution by natural selection explains the ____ of life on earth. Evolution is a change in the ____ of an allele, within a ____ over time, and natural selection is the ____ selection of traits by the ____ which determine whether an organism is able to survive and reproduce ____ offspring. Genetic ____ within a population is caused by random ____ and the recombination of genes within the ____ of organisms that are reproducing. Factors within the environment may then create a ____ for or against a given trait. Over time, traits which allow an organism to ____ successfully will ____ in frequency among a given population.

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