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Biogeochemical cycles which are powered by the flow of energy. |
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The chemical substance that an organism needs to sustain life are called nutrients |
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These bacteria convert nitrogen gas into ammonia, a process known as nitrogen fixation |
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Other bacteria obtain energy by converting nitrates into nitrogen gas, which is released into the atmosphere in a process called denitrification |
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The nutrient whose supply limits productivity is called the limiting nutrient |
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