If a physoclistus fish removes gas from its swim bladder, this fish's density cannot actually change until that gas arrives at the
A) mouth.
B) gills.
C) skin.
D) heart.
E) anus.

Question

Quizplus · Accepted Answer

When a physoclistus fish removes gas from its swim bladder, the gas must pass through the bloodstream and eventually be released through the gills. It is at this point that the fish's overall density will be affected, as the gas will be expelled into the water and the fish's buoyancy will be altered. Therefore, the correct answer is B (gills).

If a Physoclistus Fish Removes Gas from Its Swim Bladder