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ear
The ear is the organ that detects sound. It not only receives sound, but also aids in balance and body position. The ear is part of the auditory system.
Often the entire organ is considered the ear, though it may also be considered just the visible portion. In most mammals, the visible ear is a flap of tissue that is also called the pinna (or ''auricle'' in humans) and is the first of many steps in hearing. Vertebrates have a pair of ears placed somewhat symmetrically on opposite sides of the head. This arrangement aids in the ability to localize sound sources.
==Structure==
The shape of the outer ear of mammals varies widely across species. However, the inner workings of mammalian ears, including humans', are very similar.
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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