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The second classification principle of organisms is the lineage classification principle aiming at establishing evolutionary lineage. The classification method following this principle is called lineage classification. The representative of pedigree classification is "branch systematics". It advocates that the branches in evolution should be taken as the criteria for identifying and distinguishing classification units and the basis for determining the pedigree relationship of each classification unit. The so-called co-ancestral proximity (similar to a group of people being a grandfather) is used to measure the genetic relationship between different taxa and determine their position in the pedigree. The classification system finally established is an evolutionary pedigree reflecting the history of phylogeny, which is a deeper description of biological relationship. In other words, the basic principle of pedigree classification is that the classification system conforms to the evolutionary pedigree. Pedigree classification is only applicable to organisms and cannot be used for abiotic classification.“新婚的男女主角生活有滋有味，女主的弟弟，同时也是男主的”好基友“（男二号）厚脸皮地和他们同住，三人生活笑料不断。而他们的各路亲朋好友，也常常来到他们的公寓，带来啼笑皆非的故事。“影片改编自马克·吐温所著的《王子与乞丐》，讲述了安娜丽丝公主与和她外表却长得一模一样的贫穷乡村女孩艾丽卡相遇相识以及最后两人都找到了自己心中真正所爱的故事。Rare pearl影片讲述了美丽的“无岛”上七名居民连续被杀的故事，徐英姬扮演的女主人公，从原本淳朴的女性一瞬间变成了残忍的女人。另一位主人公池成媛则是见证了一连串事件的人。Hulu宣布续订《深入黑暗 Into the Dark》第二季，使其起码播至下年秋档。