Question

multiple choice question
a bony fish can adjust its buoyancy in the water by expanding or contracting the volume of its
o swim bladder.
o gill cover.
o lateral line.
o gills.

Explanation:

A bony fish uses its swim bladder to adjust buoyancy. The swim bladder can expand (increasing volume, reducing density) to rise or contract (decreasing volume, increasing density) to sink. Gill cover (operculum) protects gills. Lateral line detects vibrations. Gills are for respiration.

Answer:

swim bladder.