What defining feature places *O. virginianus* in the Class Mammalia?
Answer
The presence of mammary glands used for nursing their young.
Membership in the Class Mammalia is confirmed by several non-negotiable biological characteristics, among the most crucial being the presence of mammary glands. These glands enable females to produce milk, which is then used to nurse their offspring, ensuring early nourishment for fawn survival through parental care. Other key mammalian traits include having hair or fur covering the body, possessing a neocortex in the brain structure, and having three bones in the middle ear.
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