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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.　　与曹雪言别后，徐天在邮箱里意外发现一封匿名恐吓信。信中暗示到当年那场事故，威胁徐天要以命偿命。果然，徐天身边的亲友陆续面临险境。徐天终于信以为真，前妻艾华(应急大队成员)亲自赶到酒店，却发现徐天已经中毒。当徐天得知艾华即将嫁给周静之(应急队长，自己的前战友)时，有意疏远艾华。! AdminI read some strategies and said that it is OK to kill the first five firearms division in a fixed sequence, but to be on the safe side, please use the bridge as the dividing line and kill the first seven in the sequence indicated on my map! ! !就在大家以为二人有一场龙争虎斗的时候，红椒却趁那靖军闪避的当儿，小蛮腰一扭，擦着他的身子急掠而过，冲向下一关。Heartland" Is A Canadian Television Drama Series, Which Debuted On CBC Television On October 14, 2007. The Series Is Loosely Based On The Heartland Books By Lauren Brooke. On March 7, 2008 CBC Announced The Show Will Return For A Second Season. On January 20, 2009, It Was Announced On The Heartland Blog On The Show's Official Website That The Show Has Been Renewed For A Third Season. Set Against The Stunning Vistas Of The Alberta Rocky Mountains, Heartland Is A Sprawling Family Drama That Follows Sisters Amy And Lou Fleming And Their Grandfather, Jack, Through The Highs And Lows Of Life On A Horse Ranch. Amy Continues To Keep Her Mother’s Dream Alive By Healing Abused And Neglected Horses.