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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.Production plant当他的新女友April临产时，Stuart很快发现自己不得不依靠前妻Kate送她去医院。斯图尔特认为他“处理的情况,他被迫面对一个滥交的父亲,女儿newly-shaved头和他的惊喜返回错误的兄弟,谁是在逃避一些非常令人讨厌的类型。板栗却示意小葱先走，说他跟小叔说几句话儿。Mystery:还可以编个蛛网，去粘树上的知了，也是一样能吃。