yes, because they can be great entertainment at circuses. They are also used in some war practices.
Sonar is useful to dolphins because it tells them how big and how far something is. It tells them what is surrounding them. It can also tell them if a dolphin is female or male for mating.
Dolphins have flippers because they are useful for navigating in water. Since dolphins live their whole lives in the water, they do not need feet. Flippers are useful for steering.
A useful echo is echolocation, which is used by marine animals such as dolphins to locate and then hunt their prey
yes they pollute water and that kills bottlenose dolphins
A useful young man
Sound is useful for dolphins to stay with their pack and hear fellow dolphins shout alarums, but sight is also important for finding the surface and escaping said danger.
culao
Orcas and Polar bears, and man, when they are caught in fishing nets, or when man pollutes the water the dolphins live in. Dolphins' enemies are sharks. they cope with them by nudging the sharks in the gills (i think) when they are around.
biology is useful in every one
giraffes useful to mankind ?
No Dolphins in general are not dangerous to man.
Well, they were not apes or dolphins who fought the battle.