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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.最令人兴奋的是，汪直虽然起事，对于东海以外的地方却没有任何兴趣，只求以光荣的身份回到自己的家乡。板栗垂眸一笑，复又抬眼道：这只是农家食肆，也就是让书院的老爷们吃些家常饭菜而已，不敢卖酒。Ghost Dust 10III. Precautions