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Dolphins are marine mammals that are closely related to whales and porpoises.
Porpoises are more closely related to dolphins than whales. Both porpoises and dolphins are part of the family Delphinidae, while whales are a separate family within the order Cetacea.
You can tell by their bones.
The balance organs are the sensors in the body closest to the hearing organs. Sometimes referred to as 'vestibular organs' for they lie alongside the vestibule in the ear.
Dolphins are affected by humans because of all the litter thrown into the sea. Also, the amount of fishermen catching fish, they sometimes catch dolphins too. It is drastically dropping the number of dolphins left in the wild.
Dolphins are marine mammals closely related to whales and porpoises.
Uranus
The balance organs are the sensors in the body closest to the hearing organs. Sometimes referred to as 'vestibular organs' for they lie alongside the vestibule in the ear.
Dolphins are part of the animal kingdom Animalia and have 40 species throughout 17 genera's. Dolphins are closely related to whales and porpoises.
Inbreeding!
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 are mammals closely related to whales and sea cows. They are also related to hippos (but not as closely).