Man of them are, such as the various fish and other underwater animals that live deep deep down, however not all are. All mammals (this includes underwater) are warm-blooded.
yes
a few of the sea animals cannot stay under water for a long time.
All sea animals swim to find food. Like for example like seals, seals find food by swimming under the sea and catch fish. sharks find food by swimming under and sea and kill fishes or other sea animals. That's is your answer; there is many more :)
Like all reptiles alive today, green sea turtles are cold blooded.
sea turtle are reptile, so that means they are coldblooded animals. all species have legs modified into efficient swimming flippers.
There are a variety of sea animals. These include sea lions, the whale, sharks, walruses, manatees, as well as dolphins.
Yeti crabs, like most crustaceans, are coldblooded (ectothermic). This means their body temperature is largely determined by the surrounding environment, and they do not regulate their internal temperature like warmblooded (endothermic) animals do. They thrive in cold, deep-sea habitats, where their physiology is adapted to the ambient conditions.
No, all sea animals are not mammals. Fishes are not mammals, but dolphins are mammals.
No, sea animals do not have restrooms, however, all animals, including sea animals, make waste just as humans do.
No, Mammals are all warm blooded. Reptiles and Amphibians are cold blooded, as are Sea Creatures (Salt & Fresh Water) that are not Mammals.
There were no animals during this period. The only life forms were primitive bacteria which lived in sea waters. They survived by being under sea. All others were wiped out.
well seals,dolphins,and whales but that's mostly all of them