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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In contrast, intermediate typists are expected to type at least 25 to 30 wpm. As you progress, your speed naturally increases. The average wpm at which many people type is 31 to 41 while professional typists have a 42 to 54 wpm speed. The two highest levels of typing, known as typemaster and megaracer, have wpm speeds that range from 55 to 79 and 80+, respectively.