The physical characteristics of a human being may vary depending on age, sex, ethnicity, and other factors. In general, humans are bipedal, with two arms, two legs, and a head. They have a complex nervous system, comprising a central nervous system and a peripheral nervous system. They also have a sophisticated sensory system, which includes the eyes, ears, nose, skin, and mouth, among others. Humans may also have hair, fingernails, and toenails.
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