2. How does a fish manage to rise up and move down in water?
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How does a fish manage to rise up and move down in water?
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A swim bladder is just an expandable sac, like a human lung. To reduce its overall density, a fish fills the bladder with oxygen collected from the surrounding water via the gills. ... When the bladder is expanded, it displaces more water and so experiences a greater force of buoyancy.
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