It depends on the shark, it depends on the species of dolphin.
Sharks are pretty smart. They pick and choose prey (nothing too dificult and they prefer the fattier stuff like seals). Larger sharks aren't so much scared of dolphins, but they probably avoid large groups of them because hunting then becomes too dificult and not worth the effort. Smaller sharks are eaten by dolphins (or at least older sicker dolphins, they are not a prefered food). Larger aggressive sharks like the great white, tiger, and hammerhead aren't scared of anything and will eat what and when they like if it's available.
and Killer whales...
preditors.
A bottlenose dolphin does not have a preditor, but it is one to other sea creatures.
Sharks or possibly dolphins
bull sharks, tiger sharks and dusty sharks
they would never hurt anyone
Dolphins jump out of the water because they ar looking where they ar or they ar avoiding the preditors
i think that dolphins use their beaks to pretect it from preditors even though it does,nt have that much preditors it just uses it for any danger
they run like losers
yes they can run actually they run very fast it is an instinct to avoid preditors.
Dolphins are capable of defending itself in a group against preditors, but if alone I would say a group of sharks.
yes other insects
To catch thier prey and to run away from preditors