Eustachian tube has single opening in the pharynx of

Birds

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Amphibians

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Pipa toad

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Both A and C

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Solution

The correct option is B Both A and C
The eustachian tube also known as the auditory tube or pharyngeal tympanic tube is a tube, that links the nasopharynx to the middle ear. It is a part of the middle ear. The Eustachian tube has two openings generally except birds and pipa toad, where there is only one opening of the eustachian tube.

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