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...mple, the swim bladder purportedly evolved as an adaptation for control of buoyancy later exapted as a respiratory organ in various groups of fish.<ref>[http:/

...m bladder of skeletally heavy fish evolved as an adaptation for control of buoyancy but was exapted as a respiratory organ in certain fish and in land vertebra

...m bladder of skeletally heavy fish evolved as an adaptation for control of buoyancy but was exapted as a respiratory organ in certain fish and in land vertebra

...ay approached. Jenkins says that he faced potential victory with much less buoyancy than when he defiantly faced the prospect of defeat four years earlier.<ref