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jaw
The jaw is any opposable articulated structure at the entrance of the mouth, typically used for grasping and manipulating food. The term ''jaws'' is also broadly applied to the whole of the structures constituting the vault of the mouth and serving to open and close it and is part of the body plan of most animals.
==Arthropods==
In arthropods, the jaws are chitinous and oppose laterally, and may consist of ''mandibles'' or ''chelicerae''. These jaws are often composed of numerous mouthparts. Their function is fundamentally for food acquisition, conveyance to the mouth, and/or initial processing (''mastication'' or ''chewing''). Many mouthparts and associate structures (such as pedipalps) are modified legs.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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