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Animals like whale, walrus live in water (ocean). Are they included in Pisces or Mammalia?

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Animals like whale, walrus live in water (ocean). Are they included in Pisces or Mammalia? Select the correct answer from above options Science questions and answers, Science questions pdf, Science question bank, Science questions and answers pdf, mcq on Science pdf,Science book pdf,Science pdf notes,Science lecture notes,Science of light,maxwell Science,Science proposed by,electromagnetic theory engineering physics,Science nptel

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Whale and walrus are aquatic and marine mammals. They do not belong to class Pisces. They do not have gills to breathe in dissolved oxygen in water. Neither they have scales on the body nor can they lay eggs. Whales and walrus have mammary glands like all other mammals. They give birth to live young one. They breathe only with the help of lungs by putting their nostrils out of the water at surface. Hence they are included in Mammalia.

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