Concept:The mammalian ear is divided into parts for hearing and for balance. The part responsible for maintaining balance is the vestibular system.
Explanation:The cochlea is concerned with hearing, not balance.
The pinna is the outer visible part of the ear that collects sound waves.
The perilymph is a fluid within the inner ear that helps transmit sound vibrations.
The vestibular system consists of the vestibule and the semicircular canals.
The semicircular canals detect head movement and help maintain equilibrium.
Therefore, the vestibular system is the part that maintains balance.
Answer:D. vestibular system.