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Animals like whale, walrus live in water...

Animals like whale, walrus live in water (ocean). Whether they are included in pisces or mammalia?

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(i)Whales and walrus are included in mammalia. They are aquatic mammals.
(ii) They are walm blooded animals.
(iii) They breath air and mothers feed their babies through mammary glands just like humans do.
(iv) Fishes (Pisces) a re cold blooded animals and breathe through their gills and do not have mammary glands.
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