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Their gills are rather primitive compared to those of fish that do not have to keep pumping water into their gills by constantly swimming.

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12y ago

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Do hammerhead sharks never stop swimming around?

They do not stop swimming, if they did they would die.


Do sharks swim asleep?

Sharks can never stop moving, because of the way their gills are. If they stop swimming, water will get in, and they will drown and die.


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Tiger sharks do not live in caves since they hunt so much (if a shark stops swimming it will die)


Why are sharks on the endangered list?

A major reason is that people will cut off their fins for food. That causes the shark to stop swimming. Sharks have to swim or they will drown. The sharks drown and die.


Do sharks sit on the bottom of the ocean floor?

Although sharks may graze on the bottom, they never actually sit on the ocean floor. Sharks have to constantly keep swimming, even in their sleep or else they will die.


What are facts about about great white sharks?

they have three rows of teeth, they cannot stop swimming or they will die, no human has ever seen great white sharks mating


Do sharks hibernate?

No, sharks do not hibernate. While some species may reduce their activity during colder months, they do not undergo true hibernation like some mammals do. Sharks have to keep swimming to pass water over their gills for oxygen intake.


Do sixgill sharks migrate?

no because every tipe of shark cold die if they dont stop swimming. plus they dont sleep


Do sharks need to move constantly?

No. This is a common miscomception. Fish need to move to filter water through they're lungs to get Oxygen. But Sharks gills contract and expand to draw water in and can remain motionless, and healthy like Nurse Sharks.


Do sharks die why?

Too many fishers are leaving nets in the ocean and sharks get caught in them and to survive sharks must keep swimming to force the seawater through their gills to separate water from oxygen. Also cutting off shark fins to make shark fin soup kills them.


Why are cartilaginous fish such as sharks constantly moving?

If sharks did not move then they would die, when they move its like they are breathing, I know we dont do it but they are sharks ya know xD


How do sharks live?

A Shark lives mainly in the ocean constantly swimming. It's bladder does not have an air bubble like other fish, so if it would stop swimming it would sink to the bottom of the ocean and die.SuperSlasherSome sharks ca pump water over their gills so they won`t die. The bull and Greenland sharks can live in freshwater.