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4 votes
The largest reservoir of nitrogen is found in which of the following?

A. earthworms
B. marine organisms
C. atmosphere
D. trees

User Vanethos
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1 Answer

5 votes
The answer is C. atmosphere.

An atmosphere contains about 78 percent of nitrogen gas. In animals plants, nitrogen can be found as a part of some macromolecules (proteins, nucleic acids), but in much smaller amount than in the atmosphere, which is the highest nitrogen source.
User Dan Saltmer
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