Why are bacteria such as Rhizobium and cyanobacteria so important in the nitrogen cycle?
A. They return nitrogen gas to air
B. They fix atmospheric nitrogen gas for the food chain
C. They decompose dead plants and animals
D. They build protein in plants

The correct answer is B

Explanation:

Got it correct on GAVS..

chemical because it warmed up which involves temperature and it bubbled which includes changing

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primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs