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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:15.3 The visual field is abnormal and unqualified.This kind of situation will also occur among female journalists. Whether it is due to differences in news concepts or competition for positions, there will always be a phenomenon of mutual exclusion.The third handshake: the client receives the SYN + ACK packet from the server and sends the confirmation packet ACK (ack=k+1) to the server. After the packet is sent, the client and the server enter the ESTABLISHED state and complete the three handshakes.我来找你们，是想让你们在帐篷附近看着，不要让人随便闯进来。但是他错了，项羽毫不犹豫地动手了，他死不瞑目。Overlay mode. Whether the pixels are Multiply or Screen blended depends on the underlying color. The colors will be mixed, but the brightness details of the highlights and shadows of the underlying colors will be preserved.