How Does a Swim Bladder Help the Ray-Finned Fishes Maintain

Multiple Choice

How does a swim bladder help the ray-finned fishes maintain buoyancy?

A) It removes water from the digestive tract.
B) It removes oxygen from the water and stores it.
C) Gas is added to the bladder as the fish's depth increases.
D) Gas is removed from the bladder as the fish's depth increases.
E) It adds and removes salt from the water stored in the bladder, which changes its density and thus its buoyancy.