WHICH CYCLE ARE THESE STEPS DESCRIBING?
Nitrogen moves from the air, to the soil, into living things, and back into the air.
Free nitrogen in the atmosphere is combined with other elements through nitrogen fixation.
Nitrogen is fixed into compounds used by other organisms.
Decomposers break down waste and the remains of organisms and return nitrogen compounds to the soil.
Certain bacteria releases some free nitrogen back into the air.
When living organisms die, bacteria and other decomposers break down the materials (breaking larger molecules into smaller ones) in biomass.
The decay of biomass produces matter in the form of small molecules and releases energy stored in the chemical compounds in biomass.
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