Complete the following cycle by labelling A-D and answer the given questions.
(i) What will happen, if step D does not occur?
(ii) State two free-living nitrogen-fixing bacteria.
A - Ammonification B - Nitrites
C— Nitrates D — Denitrification
(i) If step D does not occur then there will be no replenishment of atmospheric nitrogen.
(ii) Azotobacter and Clostridium.