(D) In frogs,the ear $(ear)$ acts as a dual-purpose organ. It is responsible for both hearing and maintaining the balance of the body $(equilibrium)$.

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(D) In frogs,the ear $(ear)$ acts as a dual-purpose organ. It is responsible for both hearing and maintaining the balance of the body $(equilibrium)$. The internal ear contains structures that detect changes in position and movement,which helps the frog maintain its posture and balance.