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 swim bladder that is kept filled as the fish periodically swims to the surface and gulps air.
C)through the presence of a swim bladder that is regulated internally by structures that add or remove gas from the bladder by capillary beds.
D)All of the choices are methods for achieving buoyancy.
E)None of the choices is correct.

Question

Quizplus · Accepted Answer

Different fish species have evolved various mechanisms to maintain buoyancy. Some fish, like sharks, have large, oily livers that increase their buoyancy. Others have a swim bladder, an internal organ that can be filled with gas either by gulping air from the surface or through gas exchange within the body, regulated by specialized structures. Therefore, all the choices listed are correct methods by which different kinds of fish achieve buoyancy.

The Mechanism Whereby Buoyancy Is Achieved in Different Kinds of Fishes