Here is the matching of the items in the left column to the items in the right column:
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ammonification
- process by which certain bacteria convert organic nitrogen into ammonia and ammonium salts during decomposition
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assimilation
- process by which plants or animals convert nutrients into usable organic compounds, such as proteins
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denitrification
- process by which certain bacteria convert nitrates into nitrogen gas
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nitrification
- process by which certain bacteria convert ammonium into nitrates
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nitrogen fixation
- process by which certain bacteria in the soil convert nitrogen gas into ammonia and ammonium
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photosynthesis
- process by which green plants convert carbon dioxide, water, and energy from the Sun into sugars
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respiration
- process by which living cells produce usable energy from food