A shark has to swim constantly all its life to prevent its body from sinking because it is heavier than other types of fish.

Question

Quizplus · Accepted Answer

Sharks do not have to swim constantly to prevent sinking because of their weight. They have a liver filled with oil that helps with buoyancy, and not all species need to move continuously to breathe; some can pump water over their gills while stationary.

A Shark Has to Swim Constantly All Its Life to Prevent