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Biological health hazards
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Viruses, bacteria, and other organisms that cause disease
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Social health hazards
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Lifestyle choices that endanger health
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Chemical health hazards
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Harmful artificial and natural chemicals in the environment
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Physical health hazards
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Natural disasters and ongoing natural phenomena, such as UV radiation, that can cause health problems
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Epidemiology
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The study of disease in human populations-how and where they occur and how they can be controlled
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Toxicology
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The study of how poisonous substances affect an organisms health
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Individual Responses
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Sensitivity to hazards varies with age, sex, weight, and immune system health
Many diseases have genetic as well as environmental factors
Many diseases have genetic as well as environmental factors