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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.侥幸第一季After the real estate speculation boom occurred in Dandong, a small border town, at the end of April, the reporter rushed to the scene immediately and made three timely, responsive and better-than-peer reports through multi-channel interviews, reflecting the investigation ability and enthusiasm of the interface and the reporter in grasping hot events.花无缺身体微颤。在一个以昆虫为主的后世界末日的废墟中，一只有感知力的蟑螂发现了被遗忘的《氰化欢乐秀》VHS录像带，从而揭开了最疯狂的一季。本季将在一个满是古怪角色的荒谬宇宙中，探索大家都在问的问题，以及一些无人问津的问题行至绍兴官员阵前，杨长帆该下马下马，上前行礼道：救援来迟。