Ключевые слова: analysis, assesses, bacteria, biological, biology, biotechnology, channel, checks, chemical, chemist, ecologist, ecology, environment, environmental, examine, glass, glove, harmful, herbs, infection, intestinal, lab, laboratory, leaf, man, mask, microbiologist, nature, plant, poisoning, pollution, protective, research, researcher, reservoir, river, safety, sample, science, scientist, seedling, taking, test, tweezers, urban, water,