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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.　本山传媒《#刘老根4#》开机，优酷预计2021春节档贺岁播出。夜晚，被荠迷住的小光向她请求。3. Online Deferral　　阴错阳差后越洋交换了住所，她们的人生开始变得不同....在大航海时代伟大壮举与人类进步的背后，是侵略，屠杀，吸血，殖民者变得更加强大，进行更大规模的掠夺，史无前例的机遇给与了贪婪广袤的土壤，贪婪与野性的疯狂成长则开创了下一个时代。