shark has lungs,yes or no
Answers
Most species of sharks have gills.
Like bony fish, sharks breathe by extracting dissolved oxygen from water. The water enters the mouth, passes through the gills and is expelled through gill slits behind the head. In bony fish, these slits are covered, but in most sharks you can see them clearly. As the water flows through the gill opening, it passes tiny gill filaments. These filaments are covered with microscopic blood vessel capillaries, which have a lower oxygen content than the water around them. This imbalance causes oxygen in the water to diffuse into the shark's bloodstream, where it is distributed throughout the body.
Some sharks have a gill pump, a set of muscles that suck in water and push it past the gills. This works something like our lungs -- the shark can continuously gather oxygen while it is in a still position. Most sharks also extract oxygen using ram ventilation, passing water over the gills by moving forward. Some highly-active sharks depend on ram ventilation almost entirely, which means they stay in motion most of the time!