<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
why are some people from africa so black?
<|assistant|>
The reason some people from Africa are so black is due to the presence of dark pigment called melanin. People with more melanin are generally darker skinned. Melanin is produced by special cells called melanocytes, which are found in higher numbers in darker skin tones. In certain areas of Africa, the sun's ultraviolet rays can cause the skin to absorb more melanin, resulting in deeper pigmentation.