A) Exocoetus
B) Rana
C) Echis
D) Hippocampus
Correct Answer: B
Solution :
Amphibians (.i.e. Rand) show the formation of middle ear for the first time. They have no external ear. Middle ear is in the form of an air filled chamber called tympanic cavity, which is externally closed by ear drum or tympanic membrane. Middle ear contains a single rod-like ossicle, columella auris and a stapedial plate.
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