The atmosphere is full of nitrogen gas (N2). But plants cannot use nitrogen in this form. Summarize the roles of bacteria in making nitrogen available to plants and in returning nitrogen to the atmosphere.

Nitrogen fixation by azotobacter.

Explanation:

Nitrogen fixation explains the

role azotobacter plays in the conversion of atmospheric nitrogen into ammonia and organic derivatives, by natural means, something special about this conversion is that these microorganisms are in the soil, and the forms they convert Nitrogen into, is a form that can be assimilated by plants.

answer: the answer is b

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.