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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.Physical Attack +15 (Maximum +20)生在“空姐世家”的玉美美，被父母安排到美国深造，却故意大闹出关口留在了国内，并宣布举办网络空姐选拔大赛。于是，家庭和行业都出现了多米诺骨牌式的连锁反应，以“梅兰竹菊”空姐世家为核心的各色人等纷纷卷进了这个越来越大的漩涡。旁人暗暗称奇，谁都知道海瑞和地主是你死我活的关系，怎么对待地主的儿子如此和蔼？多谢老师称赞。The first scheme is to use the general coding method to realize the preloading technology of the picture. First, create the imgNode element, Then when the method myImage.setSrc is called, a preloaded picture is given to the picture first, and when the picture is loaded, the img element is assigned a value. The second scheme is implemented by using proxy mode. MyImage function is only responsible for creating img elements, proxy function ProxyImage is responsible for setting loading pictures for the picture, and when the picture is really loaded, myImage.setSrc method in myImage is called to set the path of the picture. The advantages and disadvantages between them are as follows:"In this way, given the situation at that time, it should be extremely unfavorable to the defense of position 149. So many giant" killer bees "besieged you. If not handled properly, it could even lead to complete annihilation. How did you tide over the difficulties at that time?"以前的武侠，乃至《天河魔剑录》都是弱爆了。