Why are bacteria needed in the nitrogen cycle? other living things cannot use atmospheric nitrogen. other living things cannot use the nitrogen in plants. bacteria are the main nitrogen reservoir. bacteria are the main nitrogen transporters.

Bacteria are needed in the nitrogen cycle because other living things cannot use atmospheric nitrogen.

As far as nitrogen fixation is concerned, only bacteria are able to fix atmospheric nitrogen into forms usable by other living organisms.

They convert atmospheric nitrogen into chemical forms usable by plants.

Some bacteria fix nitrogen through symbiotic association with the root nodules of leguminous plants while others fix it by non-symbiotic association.

More on nitrogen fixation can be found here: link

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

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