The function of the is to regulate the flow of gases into the respiratory tract and to prevent anything other than gases from entering the respiratory tract

Nail fungus, which can cause the nails to crack, peel and change color and texture.

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Personality is a mixture of characteristics/qualities that form an individual's distinctive persona. it can be influenced by environmental and biological factors; one's culture is a most important factor that shape personality. extreme mood swings, unstable relationships, distorted self-image, impulsive/risky behavior, explosive anger, chronic feelings of sadness/emptiness, etc. these could indicate that someone could have a personality disorder.

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