D. Trachea, is the answer.
The hair, skin, and nails are part of the integumentary system. This system grows from biotin.
Answer: D) Integumentary
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I guess you could say eating disorders are common. In my opinion it just depends on the location one is in. For example, African villages don't get much food, therefore it's common over there. That being said, some long-term consequences may be hurting your overall health. Hope this helped!