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Submitted: 15 October 2026 You are already at the latest version Accumulating evidence indicates that the main adaptive function of meiosis is the repair of damage in germ line DNA, transmitted from parent to progeny. This view contrasts with the alternative view that meiosis is primarily an adaptation for generating new genetic variation that might provide a competitive advantage.
Water is essential for life, and many types of organisms live and thrive in water. Many of them are harmless, but some are a nuisance and others are pathogens (disease-causing). One of the goals of water treatment is to remove nuisance organisms and pathogens but not to completely sterilize the water. This means water entering distribution systems likely has some degree of nonpathogenic organisms in the water column.
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