The result of ________ over evolutionary time spans is that alleles that allow organisms to survive and reproduce at a higher rate than other individuals become more common in the population.

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Natural selection is the process by which organisms with advantageous traits are more likely to survive and reproduce, passing these traits on to their offspring. Over time, this can result in certain alleles becoming more common in the population, as individuals with those alleles are more successful at passing them on. Artificial selection and gene flow can also influence allele frequency, but do not occur naturally over evolutionary time spans. Homology refers to the similarity of traits between different species, and is not directly related to allele frequency or evolution.

The Result of ________ Over Evolutionary Time Spans Is That