Domestic dogs are good friends of humans. Despite the great differences between them, these different groups of domestic dogs have a common ancestor-the gray wolf. Grey wolves are widely distributed around the world, but domestic dogs from different places are not from different places. The gray wolf evolved. Starting from the genome D. NA. comparing the genetic diversity of domestic dog populations from different regions, the researchers found that domestic dog populations from southern East Asia have the highest diversity. At the same time, the phylogenetic tree The structure also supports the above conclusions. On the phylogenetic tree, the end of each branch represents a group, and the more closely related groups will also be closer to the tree. Domestic dog samples from southern East Asia are all located in the Phylogenetic tree base location. What does this text mean? ['Domestic dogs originate from the very widely distributed gray wolf.', 'Domestic dogs of different temperaments and shapes have a common origin.', 'Phylogenetic tree principle provides support for animal evolution research.', 'Research on D. genome D. NA. Fundamentally solves the problem of domestic dog origin.']