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nutrients are substances that and organism uses to build and repair the cells of its body |
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which are pure substances that cannot be broken down into simpler substances. |
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| for example, carbon dioxide is exhaled by a wildebeest. |
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| the cycles that water, carbon, and nitrogen follow all have reservoirs |
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some water seeps down through the soil into the ground water |
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converting nitrogen gas into ammonia |
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| perform this critical step. without these bacteria, movement speed of nitrogen would stop almost completely |
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