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The causation of disease is a complex interplay of multiple factors, both internal and external, which significantly influence human health. Understanding these factors is essential in the study of the inter-relationship between health and environment. One of the primary contributors to disease causation is the environmental factor. This includes physical (air, water, soil pollution), biological (bacteria, viruses, parasites), and chemical (pesticides, industrial _____ _________ __________ __________ _________ ______ ____ _____ _____.
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