Ключевые слова: analysis, background, biologist, biology, biotechnology, caucasian, check, chemical, chemistry, control, eco, ecologist, elderly, environment, exam, examination, explore, glove, green, hand, health, liquid, look, mature, medical, nature, occupation, outdoor, park, physics, pollution, professional, protection, research, researcher, river, safety, sample, science, scientific, scientist, senior, summer, test, test tube, tube, water, wood, worker,