The tympanic cavity in frog communicates with pharynx ventrally through

Bidders canal

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Horizontal canal

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Semicircular canal

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Eustachian tube

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Solution

The correct option is D Eustachian tube
As shown in the diagram, the tympanic cavity communicates with the buccopharyngeal cavity through the eustachian tube. It controls the pressure within the middle ear, making it equal with the air pressure outside the body.
So, the correct option is 'Eustachian Tube'.

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