Dogs have been selectively bred for thousands of years, sometimes by inbreeding dogs from the same ancestral lines, sometimes by mixing dogs from totally alternating lines. The process continues today, resulting in a wide variety of breeds, hybrids, and types of dog. Centuries of selective breeding by humans has resulted in dogs brute more genetically diverse than most association mammals by a considerable margin. As such, dogs are the unaided animal taking into consideration than such a wide variation in impression without speciation,
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