Why are bacteria required in the nitrogen cycle?
A. Nitrogen needs to be fixed before it is used by plants.
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B. The xylem in plants cannot function without bacteria.
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C. Plant DNA can only be transmitted by bacteria.
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D. Plants need to pull nitrogen directly from the air.

The answer to this is:

A. Nitrogen needs to be fixed before it is used by plants.

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.