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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.满心落寞的同时，又不忍心怪她。小葱微微一笑，心道今儿就让你们这些男人都见识见识。小熊猫源克历尽千辛万苦终于找到了失散多年的父亲，开始了学习中医的历程。但黑虎与马戏团团长申野合谋了组建大型马戏团的计划，于是开始抓森里里的动物。就在这时黑虎突然病倒，并且很严重。小熊猫源克最后用针灸终于治好了黑虎的病。黑虎开始反思自己并且悔过自新，释放了森林里的所有动物。E level of economic development;所以很多人格外气愤，感觉自己被欺骗了。