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Describe the structure and function of human ear?
  
Answer variants:
Signals
Vibrations
vibrations
Ear drum
Pinata
 
a. The vesicles move inward and outward when a sound wave strikes the drum, creating 
.
  
b.
 refers to the visible portion of the human ear .
  
c. 
 from the sensory cells is perceived as sound by brain.
  
d.
 are sent to the brain in the form of signals from the inner ear.