Genetic drift, the variation in the relative frequency of different genotypes in a small population., Gene flow , the transfer of genetic material from one population to another. Gene flow can cause evolution because the animals progress., Mutation , an alteration in the nucleotide sequence of the genome of an organism, virus, or extrachromosomal DNA., Natural selection , the differential survival and reproduction of individuals due to differences in phenotype. It is key to evolution..

Evolution

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