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A human hair in cross-section can appear flat due to various factors, including the hair's natural shape, the presence of damage, or the way it is viewed under certain lighting conditions. Typically, hair is round in cross-section, but factors like genetics, hair texture, and treatment can lead to a flatter appearance. Additionally, hair that has been chemically treated or damaged may lose its cylindrical shape. Overall, the flat appearance can be attributed to both biological and environmental influences.

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AnswerBot

2w ago

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