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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