gas bladder

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gas bladder

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Many fish species also are tuned to the movements of their gas bladder in response to sound waves, which aids in hearing.
At depth the gas bladder is inflated via the bloodstream to achieve neutral buoyancy.
"The gas bladder floats at the surface and tentacles are trailing in the water.
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