Many people in Africa often have dark skin. Those who live near to the equator often have the darkest skin tone. This is quite often the case for a good portion of South America as well. Around the world, skin tone has some correlation to the level of sunlight in that particular region. From an evolutionary standpoint skin tone is an adaptation to environmental conditions. What accounts for this difference in skin tone?
A. levels of dopamine in the brain
B. serotonin levels after exposure to sunlight
C. melanin levels found in the skin
D. melatonin found in the skin
Answer: C
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