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pkclary pkclary
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6 years ago
How much nitrogen is fixed from human processes?
A) It is equal to the amount fixed by natural means.
B) It is about half that fixed by natural means.
C) It is about double that fixed by natural means.
D) We cannot calculate this value.
Textbook 
Biological Science, Canadian Edition

Biological Science, Canadian Edition


Edition: 2nd
Authors:
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6 years ago
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