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Q.

Columella auris is the middle ear bone first appeared in

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a

First vertebrates

b

First land vertebrates

c

First amniotes

d

First Homeotherms

answer is A.

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Detailed Solution

In the auditory system, the columella contributes to hearing in amphibians, reptiles and birds. It is an evolutionary homolog of the stapes, one of the auditory ossicles in mammals.

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