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No, for three reasons:

  1. Sharks do not actually give birth to live young- they produce eggs which they keep inside their bodies until they are strong enough to stay alive on their own in the dangerous ocean. Sharks don't have a womb.
  2. Mammals have other characteristics, mainly that they produce milk for their young. This is the defining characteristic because primitive mammals, like platypus and echidnas, lay eggs. Also mammals must have hair or have evolved from an animal with hair.
  3. Sharks have gills and get oxygen from water whereas all mammals breathe air, so if they live in water they have to have a blowhole.
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