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Dinosaurs were all reptiles and therefore, land dwellers. None of them could breathe underwater, although marine creatures that lived along side the dinosaurs have similarities to the dinosaurs, they weren't actually classed as dinosaurs. Therefore, no dinosaurs could breathe under the water :)
EDIT
Fish and some amphibians are the only vertebrates that have gills and can breath underwater. The same applies to ancient animals too.
What else can I help you with?
Two flying dinosaurs?
There were no true dinosaurs that could fly. But two flying creatures that lived during the dinosaur times were Pterodactyl and Ornithocheirus.
What is the fastest dinosaur that ever lived?
The fastest dinosaur that ever lived was the cheetah-like dinosaur called the Dromiceiomimus, which could run up to speeds of 60 miles per hour.
Which dinosaur was the longest land animal to have ever lived?
The longest dinosaur is believed to be Argentinasaurus, which could grow to 110 feet.
What's the fastest dinosaur that ever lived?
The fastest dinosaur that ever lived was the cheetah-sized dinosaur called the Compsognathus.
What the fifth dinosaur that lived on earth?
Dinosaur dont lived Earth any more, they died.
What could you conclude if a dinosaur fossil and a bird fossil were found in the same layer of rocks?
We would conclude that the bird and the dinosaur lived around the same time.
Are dinosaur existing?
Alligators and Crocodiles lived in prehistoric times, however are not considered proper dinosaurs. Most prehistoric creatures were made extinct many years ago.
Which dinosaur lived the longest?
The dinosaur that lived the longest was the Brachiosaurus, which lived around 150 million years ago during the Jurassic period.
How did coelophsis live?
Coelophsis was a dinosaur that lived in the Late Triassic Period. The dinosaur is said to have lived in small herds with others.
Could any of the land dinosaurs swim?
Spinosaurus was a land dinosaur that scientists think could swim. It lived in what is now North Africa.
How long can a dicynodon live?
The dicynodon was an ancient dinosaur which lived in Africa. It is estimated that this dinosaur lived 250?æmillion years ago and lived partially on land and in the water.
What is the largest dinosaur ever to live?
The largest dinosaur ever to live is believed to be Argentinosaurus, which could reach lengths of up to 100 feet and weigh as much as 100 tons. This massive herbivore lived during the Late Cretaceous period in what is now Argentina.
