What set of key characteristics defines the Woolly Mammoth's placement within Class Mammalia?
Answer
Warm-bloodedness, hair/fur, and nursing young with milk
Classification within the Class Mammalia is contingent upon fulfilling several defining criteria. These critical features include being endothermic, meaning maintaining a constant internal body temperature (warm-blooded), possessing hair or fur for insulation—a vital trait for the Woolly Mammoth in frigid conditions—and, most distinctively, the females nourishing their offspring through milk produced by specialized mammary glands. These characteristics group the mammoth with modern elephants while separating it from reptiles or birds.

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