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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.Memory 1G《成为：米歇尔·奥巴马自传》带领观众近距离观察前第一夫人米歇尔·奥巴马在巨大变动期间的生活。该纪录片不仅记录了米歇尔的个人生活，也记录了这个她与丈夫在白宫期间为其付出了八年多心血的国家。这部电影带领观众走进幕后，对她的生活进行了罕见而近距离的观察：米歇尔开始了一场途经 34 个城市的旅程，这场旅行凸显了社区在弥合分歧方面的力量，以及在我们开诚布公地分享自己的故事时人与人心相连的精神。该剧讲述了一对情同姐妹的闺蜜，由相伴相知到因妒成恨的情感纠葛，在突出戏剧性、展现人物命运的同时，弘扬人性中的真善美，鞭笞假恶丑的故事。Configuration Requirements六尺之下最终季！《六尺之下》是一部美国电视连续剧，综合戏剧与喜剧元素，由艾伦·鲍尔创作，著名演员迈克尔·霍尔、瑞切尔·格里菲斯、彼得·克罗斯与劳伦·艾波罗丝等主演。