The Swim Bladders of Bony Fishes

Multiple Choice

The swim bladders of bony fishes

A) evolved from branching of the gut.
B) are used for respiration in most contemporary species.
C) are organs of buoyancy that help them control their depth in the water column.
D) prevent them from inhabiting marine environments.
E) are modifications of the water vascular system found in echinoderms.