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HUMAN EAR is a special sense organ which helps for audition and keeps body balance .It is two in number and is situated on the either sides of the head behind the eyes.It  is mainly formed of three divisions such as............
*External ear
*Middle ear 
*Internal ear
EXTERNAL EAR -IT consist of pinna,external auditory canal,and ear drums
MIDDLE EAR-It consist of auditory ossicles,and eustachian tube
INTERNAL EAR-It consists of cochlea and vestibular apparatus .

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is this explanation enough for sa2 exams???
for 3 to 5 marks it ok