By which of the following do frogs do not respire?

By which of the following do frogs do not respire?
A. Skin
B. Lungs
C. Buccal cavity
D. Ear

Answer:
D. Ear

Explanation:
Frogs respire on land and in water by two different methods. In water, skin acts as an aquatic respiratory organ. On land, the buccal cavity, skin and lungs act as the respiratory organs.