combustion , Burning fossil fuels to keep factories running, nitrogen fixation, When atmospheric nitrogen is captured by bacteria living in plant roots, decomposition, When fungi and bacteria return nutrients from dead organisms to the soil, photosynthesis , When plants capture sunlight and convert carbon dioxide and water into glucose, cellular respiration, When organisms break down carbon-based molecules like glucose and release CO2, fossilization, When dead plants or animals become fossils, denitrification, When nitrogen from dead and decomposed organisms is returned back to the atmosphere by bacteria.

Nutrient Cycles

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