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Human's classification consciousness and practice on vegetation, animals and other organisms have existed since ancient times. They existed in ancient China and ancient Greece, and developed into a science-taxonomy. However, the early classification was mainly based on morphology, such as the shape of roots, stems and leaves. Taxonomy based on morphology is the oldest discipline in biology, and the earliest phyla, classes, orders, families, genera and species basically came from here. Taxonomy in the general sense refers to a specialized discipline that identifies, identifies, describes, names and classifies organisms. The task and purpose of taxonomy can be divided into two parts:2017年1月5日，星期四，美国广播公司为时两小时的特别节目，名为《真实与谎言:梅内德斯兄弟》，重新审视了这起双重杀人案并接受了采访。Method 2:Protecting the edge is never a thing that will only get honor. It is more about giving, taking risks and even life.两个情同手足的少年，在这座城市一起长大。因为宿命使然，他们分道扬镳，其中一个要去外面闯荡，另一个则选择留下，于是在出发前晚，两人相聚一个小餐馆，约定二十年后的同一日期、同一时间，来到这里再次相会。 二十年后，桑晓遍体鳞伤的回到了原地，却发现小餐馆已经变成了十字路口，他在那里等了许久，遇到一个等夜班车的男子，两人聊起了二十年前的那个约定，让桑晓没有想到的是，这个男子就是约定好二十年后跟他再见的苏强。而更令人想不到的是，二十年的岁月磨洗，已经让桑晓变成了一个恶行昭彰的通缉犯，而苏强却成了一个正义无私的警察。兄弟二人重逢在十字路口，再次面临宿命的选择。小灰站在河边对着河水狂吠不止。