Human skin color is determined by the interaction of melanin, carotene and hemoglobin. Storage of water, fat, glucose and vitamin D is also a function of the integumentary system, according to the AAD.
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Invented in 1939 by David Wonderlic, the WPT quickly gained popularity for its accuracy and swiftness. Today the WPT is used to screen job applicants and for personal analysis. Now available in 12 languages, the WPT is used as part of many psychological assessments.