To classify "dark hair" found at a crime scene, we can consider the terms pathogenic, genetic, and environmental as they relate to different concepts:
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Pathogenic: This term generally refers to something that can cause disease. Hair itself is not pathogenic, so dark hair would not fit into this category.
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Genetic: The color of hair, including dark hair, is determined by genetics. Therefore, in this context, dark hair can be considered genetic since it results from inherited traits.
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Environmental: This term refers to factors related to the surrounding environment that can influence various characteristics. While environmental factors can affect hair (such as exposure to sunlight, nutrition, etc.), the color of the hair itself—dark hair—primarily has a genetic basis.
Based on this analysis, dark hair found at a crime scene would best be categorized as genetic.