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| Elements pass from one organism to another and among parts of the biosphere through closed loops called biogeochemical cycles. |
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Definition
| The chemical substances that an organism needs to sustain life are called nutrients. |
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Definition
| These bacteria convert nitrogen gas into ammonia, a process known as nitrogen fixation. |
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Definition
| Other bacteria obtain energy by converting nitrates into nitrogen gas, which is released into the atmosphere in a process called denitification. |
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Term
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Definition
| The nutrient whose supply limits productivity is called the limiting nutrient. |
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