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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.FOX宣布续订《哥谭》第四季。　　8月19号首播，接档《情迷幽灵》，周一到周四播出，每周播出4集！21　　昆丁（德文·古梅尔萨尔 Devon Gummersall 饰）是一个非常平凡的年轻人，同时亦是一个漫画迷。平日里，他在生化科技实验室上班，是那里警卫。每一天，昆丁都会沉浸在自己的想象之中，幻想某一日他将获得一些超能力，化身成为拯救世界的超级英雄。2020年3月从戈尔韦开往都柏林的火车上，两个陌生人相遇了，他们决定走老风格：不交换电话号码，只承诺两周后在火车上碰面。紧接着全球新冠大流行导致爱尔兰进入了全面封锁。