Jovan Hadži theories of animal evolution. He devised a system of classification in which he divided the animal kingdom into six phyla: Protozoa, Parazoa, "Ameria" (animals with no segments), "Oligomeria" (animals with few segments), "Polymeria" (animals with many segments) and Chordata. His choice of characters important for classification was generally discredited by his contemporaries, and the system was never accepted by zoologists. However, due to its simplicity, the system was widely used in science education in former Yugoslavia. His other major theory was that of the origin of metazoa - he developed an existing hypothesis stating that the first multicellular animals resembling
Han Chinese subgroups in parts of Guangdong, Guangxi, Fujian, Jiangxi and Taiwan. They are one of the largest groups found among the Chinese in Southeast Asia. The origin of Gan-speaking peoples in China are from Jiangxi province in China. Gan-speaking populations are also found in Fujian, southern Anhui and Hubei provinces, and linguistic enclaves are found in Taiwan, Shaanxi, Sichuan, Zhejiang, Hunan, Hainan, Guangdong, Fujian and non-Gan speaking Jiangxi. Other minor subgroups include speakers of the Tanka people, Peranakans, Chuanqing, and Kwongsai people The culture of the Han Chinese is complex and diverse. The vast geographic scale of China has led the Han