2. Explain the importance of nitrogen and oxygen in the atmosphere.
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Oxygen is used by most organisms for respiration; nitrogen is fixed by bacteria and lightning to produce ammonia used in the construction of nucleotides and amino acids; and carbon dioxide is used by plants, algae and cyanobacteria for photosynthesis.
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Due to these properties, the nitrogen is used in food industry, steel processing, electronics and similar applications. Oxygen is also without colour, odour and taste. Compared to nitrogen the oxygen reacts with most of the chemical elements. It is necessary for most living organisms for metabolic processes.
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