Amazon is really serious about making Amazon Household really for households (and not casual sharing among friends). When you add or remove a person from your household, neither you (the Prime account holder) or they (the previous Household member) can create or join another household for 180 days.
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.
The balance system works with the visual and skeletal systems to maintain orientation. Visual signals are sent to the brain and compared to information from the vestibular systems and muscles and joints. An organ in the inner ear, the labyrinth, is a central player in the vestibular or balance system. Inside the labyrinth are three semicircular canals which are filled with fluid. As the head moves, the fluid inside the semicircular canals signals to the brain its relative motion.