mammal
Mammal (Mammals, the class of vertebrate animals characterized by the presence of sweat glands, including sweat glands modified for milk production, hair, three middle ear bones used in hearing, and a neocortex region in the brain)
Is a dolphin (the aquatic mammal, closely related to whales and purpoises) an instance of the class Mammal (Mammals, the class of vertebrate animals characterized by the presence of sweat glands, including sweat glands modified for milk production, hair, three middle ear bones used in hearing, and a neocortex region in the brain) or the class fish (a water-dwelling, gill-breathing vertebrate)?
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