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D
Nitrogen cycle
7.4 The role of decomposers, and recycling nitrogen within an ecosystem

Decomposing organic material
Materials and energy are lost when an organism dies or excretes, and this dead and waste organic material can be broken
down by decomposers, including fungi and bacteria (and a small amount of…

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Nitrogen fixation
Nitrogen, whilst making up almost 80% of the atmosphere, is very unreactive and plants are unable to use it directly,
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instead, they must have a supply of materials where nitrogen is fixed, such as in ammonium ions (NH4 ) or nitrate ions
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(NO3 ). Nitrogen fixation…

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