The ______________ is an internal gas-filled organ that helps fishes to stay at their current water depth, without wasting much energy in swimming.

Blubber

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Lungs

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Gills

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Swim bladder

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Solution

The correct option is D Swim bladder
The swim bladder is an internal gas-filled organ that helps fishes to stay at their current water depth, without wasting much energy in swimming. It also helps fishes hang motionless a few feet above the seafloor.

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The ______________ is an internal gas-filled organ that helps fishes to stay at their current water depth, without wasting much energy in swimming.

The correct option is D Swim bladderThe swim bladder is an internal gas-filled organ that helps fishes to stay at their current water depth, without wasting much energy in swimming. It also helps fishes hang motionless a few feet above the seafloor.

The correct option is D Swim bladder
The swim bladder is an internal gas-filled organ that helps fishes to stay at their current water depth, without wasting much energy in swimming. It also helps fishes hang motionless a few feet above the seafloor.