Different dog breeds have been bred by humans from a common ancestor over the past few thousand years. This is an example of

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Artificial selection, also known as selective breeding, involves humans intentionally breeding animals with desired traits, in this case, specific characteristics that distinguish different dog breeds. Natural selection involves the non-random process by which certain heritable traits become more or less common in a population due to their effects on reproductive success. Un-natural selection is not a commonly used term with a clear definition in evolutionary biology. Artificial insemination is a reproductive technology that involves the introduction of sperm into a female's reproductive system by non-natural means, which is not directly related to the breeding of different dog breeds.

Different Dog Breeds Have Been Bred by Humans from a Common