The scientist checks the water from the river for infections, harmful emissions. The concept of ecology, pollution of the earth.
Video from a series:
Video can be used in environment, chemical, water, test, environmental, sample, ecologist, nature, infection, researcher, biology, biological, protective, laboratory, protection, scientific, examine, man, biologist, tube, quality, epidemic, gloves, sampling, river, expertise, flask, bacteria, analysis, pollution, science, biotechnology, research, scientist, ecology