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Marine mammals have internalized genitalia for streamlining.
Sexual, like other mammals Placental
Polar Bears are marine mammals.
No. Sharks are a type of fish. Porpoises are mammals.
internal
Dolphins
What? your question makes no sense. Byt usually marine animals have fins or flappers to glide them through water.
Yes all marine mammals have eyelids.
Marine mammals do not live on land, and no marine mammals lay eggs. Marine mammals include whales, dolphins and porpoises.
Dolphins are marine mammals closely related to whales and porpoises.
hydras carry out asexual reproduction (binary fission) whereas mammals carry out sexual reproduction (mating)
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.