Biotic refers to which of the following?

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Biotic refers to living components in an ecosystem, such as plants, animals, and microbes. These living factors are different from abiotic factors, which are nonliving chemical and physical elements like rainfall, temperature, wind, and pH. In water surveillance, recognizing biotic elements helps identify the presence and effects of living organisms that can influence water quality, such as algae or microbial contaminants. The other choices describe nonliving aspects or characteristics: weather patterns are atmospheric conditions, and water color is a physical property that can be influenced by various factors but does not define biotic components.