Which Shark Structure is Most Analogous to a Swim Bladder

Question

Which shark structure is most analogous to a swim bladder full of gas?
A) its lateral line system
B) its spiral valve
C) its liver
D) its dead-end nostrils
E) its gills

Accepted Answer

The liver of a shark contains oil that is less dense than water, allowing the shark to become buoyant and maintain a specific depth in the water. This is analogous to a swim bladder full of gas in bony fish, which also helps them maintain their depth in the water.