Endoskeleton three phyla and one subclass of animals, endoskeletons of various complexity are found: Chordata, Echinodermata, Porifera, and Coleoidea. An endoskeleton may function purely for support (as in the case of sponges), but often serves as an attachment site for muscle and a mechanism for transmitting muscular forces. A true endoskeleton is derived from mesodermal tissue. Such a skeleton is present in echinoderms and chordates. The poriferan 'skeleton' consists of microscopic calcareous or siliceous spicules or a spongin network. The Coleoidae do not have a true endoskeleton in the evolutionary sense; there, a mollusk exoskeleton evolved into several sorts of internal
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