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They do not have bones, instead they have cartilage. They can only swim forwards! A large oily liver helps keep them afloat. Also, eggs are fertilized in the female's body. They do not have gill covers.

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12y ago

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What do sharks lack that makes them different from many other fish?

Sharks have no swim bladder for buoyancy. Instead, an oily liver aids in bouyancy.


Which body features do bony fish have that sharks do not have?

Sharks, cartilage skeleton, lack scales, lack swim-bladder,Boney Fish. bony skeleton, scales, swim-bladder, interesting colouration.


What environmental pressures do sharks have?

Lack of food


What makes the ocean different from other ecosystems?

Salt water maybe, lack of dry, giant whales and sharks.


What does a shark have that other fish do not have?

Sharks and fish come from the same family. They are similar because both sharks and fish lay eggs to reproduce. Both cannot survive outside water and breathe through gills. They are both vertebrates and have fins as their locomotory organ They both have swim bladders too.


What features enables the shark to stay afloat more easily in water?

Sharks lack a swim bladder, which enables a fish to float. Sharks must swim constantly or they will die.


Does a shark have feeling in its dorsal fin?

No. Elasmobranchs such as rays and sharks lack nociceptors, the nerves that translate noxious stimuli into neural signals. Nociceptors appear in bony fish and basically all later vertebrates, as well as some invertebrates, but are absent in cartilaginous fish such as sharks.


What kind of food does sharks get energy from?

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What environmental do sharks have?

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What are a fish's respiration organs?

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Are sharks the only fish that blink?

no they cannot! they have upper and lower eyelids but they dont move, but they do have a thrid eyelid which is called the nicititating membrane which closes to protect their eyes when biting prey! SO SUCK OUT CHEESTRING YOUR FACTS ARE WRONG! dont belive cheestring facts they lieeeeee


What do invertebrate jellyfish lack that all other fish process?

spine