by their homologous organ sturcture
they were not "invented" they evolved from other sea creatures to become dolphins
No, dolphins did not evolve from men, no other species evolved from men. Dolphins are small whales. The closest land animal to the whale is the hippo. Or at least that is the current theory. So dolphins are more closely related to horses, cows, sheep, and deer than they are to people.
Dolphins have helped drowning people to survive.
they do mate with other species of dolphins rarely
dolphins can not stay in water long time like most aquatic animals
Answer:Dolphins evolved from whales, and both of them evolved from ungulates, hoofed animals, that ate meat and took to the water. Early whales, like Himalayacetus subathuensis, lived on land but possibly lived like crocodiles.Answer:Dolphins and Whales are related to each other, so that means that Dolphins evolve from a Dinosaur named Ichthysaurus.by: AbdurabiAnswer:According to the National History Museum, London, dolphins have an ancestor in four-legged mammals similar to wolves. They used to have claw like hands which caught fish they gradually became more fin like and that is how they evolved into dolphins.
dolphins get energy by eating different foods like squid fish and other animals
dolphins are very aggressive hunters so when on the hunt they scare fish and other oceanic creatures
silly
Dolphins
Human/people can talk but animals don't! >>actually, there's lots of evidence that some species do speak to each other (whales, elephants, dolphins, dogs, primates etc etc) >>The main difference seems to be that we kill each other for fun and profit, and other animals don't. >>>Chimpanzees have wars. Dolphins terrorize and rape members of their species for fun. It comes with intelligence.
People work with dogs, horses, oxen, camels llamas, elephants, and many other kinds of animals. It all depends on where in the world they work. In a zoo, people work with all kinds of animals, but in an aquarium, mostly dolphins.