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Polar Bears are marine mammals.
No. Sharks are a type of fish. Porpoises are mammals.
What? your question makes no sense. Byt usually marine animals have fins or flappers to glide them through water.
Dolphins are marine mammals closely related to whales and porpoises.
The big whales as a rule don't eat marine mammals, but Orcas - killer whales - will eat seals, sea lions, and even other whales when they have the chance.
Dolphins are marine (sea-dwelling) mammals - they breath air, and give birth to live young.
monkeys
Whales, dolphins and manitees aka: marine mammals
The marine annelids that have many setae and parapodia are called polychata. They usually have antennae on the front of their heads and they live in marine environments.
The Sea Otter (Enhydra lutris) is adapted to an aquatic environment. As their name suggests, they are marine mammals, but unlike other marine mammals they rely on their incredibly thick fur to keep them warm--other marine mammals have blubber for the same purpose.
In mammals, it's called lactation.
ichthyosaurs