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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.Cow force强奸，是否性侵犯这么简单？一名遭人强奸的女受害人，竟是被告的妻子。一宗殉情自杀的案件，为何转化成一宗强奸案？情杀，并非只发生在男女之间的争风呷醋，一对情侣被控谋杀，但二人竟同是男性。2. Tank can't see you from the angle of view.少女们度过的快乐、热闹的日子！胡钧见她痴痴地望着北方，神情大非往常可比，忽然心里很难受，追问道：要是我们都活下来了呢？你放心，既然以前能活下来，以后我们也照样能活下来。Everyone must follow closely,