The mechanism whereby buoyancy is achieved in different kinds of fishes is
A) through the presence of a large,oily liver when a swim bladder is not present.
B) through the presence of a large swim bladder that expands as the fish periodically swims toward the surface.
C) through the presence of a swim bladder that is regulated internally by two structures that add or remove air from the bladder.
D) all of these
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