Because atmospheric nitrogen can't be used by plants and animals. Only by soil. nitrification it is the conversion of ammonia first into nitrites then into nitrates by nitrifying bacteria and denitrification is the conversion of nitrites and nitrates into free nitrogen. Why are bacteria important to the nitrogen cycle?
Answer:
I think they take in carbon dioxide and release oxygen
Explanation:
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A base , any number greater than 7 is a base .
Air has no fixed volume and fixed shaped.