Genetic drift- this is random fluctuations in the genetic material of a population.
Mutation- chance errors in genetic code occur over generations, eventually altering life, if they are allowed to snowball.
Gene flow is the transfer of alleles to separate populations. Certain individuals of a population of animals with a common characteristic mix in with a new population and change that population's characteristics.
Recombination- The crossing over of genes can result in children with different characteristics than their parents. If this is an advantageous feature, it is likely to get passed down.
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