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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.Don't sink, don't sink, the little cute with the wrong number of buildings can dd me for a moment, and I'll see if they have been swallowed.不然的话，她要是出了啥事，带累了你，你岂不是亏得很？听了这话，喜姑姑想起刚才那个春花直往板栗身边凑的情形，心里一激灵，越发不安了。2000年5月18日，座落在陕西省黄陵县双龙山上的省级重点文物保护单位千佛洞突然停电。四名不法分子在精心策划下，盗走了石窟内89尊雕刻精美的罗汉头像。千佛洞石窟是宋代我国北方唯一的一座石窟，系数百工匠用了近十年的功夫才雕刻完成。武林至尊，宝刀屠龙……文小桃眼睛一亮，眼中闪烁着兴奋之色，血液都有些开始沸腾。韩国推出的有关家庭，爱情的经典剧情片，展现了韩国的家庭故事