44.Air bladder in fish acts as ____: [A] Hydrostatic organ [B] Accessory respiratory organ [C] Both accessory respiratory organ and hydrostatic organ [D] Primary respiratory organ
It contains gas (usually oxygen) and functions as a hydrostatic, or ballast, organ, enabling the fish to maintain its depth without floating upward or sinking. It also serves as a resonating chamber to produce or receive sound.
