| Description |
Contrasts various related activities of microorganisms as explained in the nitrogen cycle and the roles played by various types of bacteria in the conversion of nitrogen from one form to another. Indicates by animation that only a small number of all microorganisms are harmful, while much greater numbers are beneficial or essential. Shows the means whereby microorganisms produce changes in their environment and cause the formation of new substances. Considers the importance of microorganisms in research and their contributions to providing man with clues to the nature of life.
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