The part labelled a in the above diagram is used for

The part labelled a in the above diagram is used for
A. Detection of pressure in water
B. Maintaining buoyancy in water
C. Gaseous exchange
D. Movement in water

Correct Option: Answer is C
Fish gills are organs that allow fish to breathe underwater. Most fish exchange gases like oxygen and carbon dioxide using gills that are protected under gill covers on both sides of the pharynx (throat).

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