the activities of denitrifying bacteria
the breakdown of ammonium salts in the soil
the activities of nitrifying bacteria
the activities of nitrogen-fixing bacteria in root nodules
egestion, death and decay
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โAtmospheric nitrogen is directly replenishedโฆโ
They are asking:
๐ช๐ต๐ฎ๐ ๐ฝ๐ฟ๐ผ๐ฐ๐ฒ๐๐ ๐ฝ๐๐๐ ๐ป๐ถ๐๐ฟ๐ผ๐ด๐ฒ๐ป ๐๐๐๐ ๐ถ๐ป๐๐ผ ๐๐ต๐ฒ ๐ฎ๐ถ๐ฟ (๐กโ)?
A. Denitrifying bacteria 
These bacteria:
Convert nitrates (NOโโป) โ nitrogen gas (Nโ)
Release it back into the atmosphere
๐ง๐ต๐ถ๐ ๐ถ๐ ๐๐ต๐ฒ ๐ข๐ก๐๐ฌ ๐ฝ๐ฟ๐ผ๐ฐ๐ฒ๐๐ ๐๐ต๐ฎ๐ ๐ฑ๐ถ๐ฟ๐ฒ๐ฐ๐๐น๐ ๐ฟ๐ฒ๐ฝ๐น๐ฒ๐ป๐ถ๐๐ต๐ฒ๐ ๐ฎ๐๐บ๐ผ๐๐ฝ๐ต๐ฒ๐ฟ๐ถ๐ฐ ๐ป๐ถ๐๐ฟ๐ผ๐ด๐ฒ๐ป.
D is for carbondioxide but that of nitrogen should be A.I.e action of denitrifying bacteria.
Atmospheric nitrogen is directly replenished in nature through **D. the activities of nitrogen-fixing bacteria in root nodules**. These bacteria, such as those from the genus *Rhizobium*, form symbiotic relationships with the roots of leguminous plants. They convert atmospheric nitrogen (Nโ) into ammonia (NHโ), which the plants can then use for growth. This process is a critical part of the nitrogen cycle and helps to maintain the ecosystem's nitrogen balance.
