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Similar to the development of children from appearance and color to older children, they can be classified according to concepts. For example, if they know the concept of "food", no matter what kind of vegetables they look like, they should be classified into one category. The classification of biology has also developed in this way. The earliest method is to identify and distinguish species according to phenotypic characteristics, and to classify them step by step according to the degree of phenotypic similarity, so as to establish a classification system that is easy to retrieve. This is the principle of phenotypic classification. However, the problem of phenotypic classification is that it is difficult to reveal the essential laws of things. Many creatures with very different shapes may have kinship relationships. For example, the online sentence "When I knew sunflowers belonged to Compositae, I collapsed" is what it means.//Modify the state of the original class等待，是为了更好的遇见。而美好的事物，值得等待。泰国BL剧《程心程意》角色海报正式发布。用你的心，换我的意，程心程意。没想到突然之间被亲兵惊醒，汉王驾到？韩信心头一震，士兵们自然不敢拿这种事情开玩笑，应该也不会有人在汉军营地前冒充。Focus 2. The second level will only add up and will not add any more.V-shaped socks are not only beautiful, but also convenient to wear and take off.Console.ReadKey ();