ecologist takes water in a test tube from a lake, river, sea. The concept of ecology, environmental pollution

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Keywords: analyze, assistant, biotechnology, blue, chemical, chemist, danger, dirty, drain, ecologist, ecology, environment, environmental, expertise, glove, hand, healthy, industrial, laboratory, nature, pipe, pollution, sanitary, sanitation, scientist, sewage, sewer, sewerage, stream, substance, technology, test, toxic, tube, waste, wastewater, water