State two roles of nitrogen in living organisms.
Figure 1 below shows a representation of the nitrogen cycle.
Figure 1
Identify the processes or substances occurring at the positions marked A-C in Figure 1.
Describe the process of ammonification shown in Figure 1.
The process of denitrification shown in Figure 1 involves anaerobic bacteria. Suggest how flooding might impact the availability of nitrates in the soil.
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