Which of the following statements about agricultural fertilizers is false?
A. Global nitrate and phosphate resources
are in decline.
B. Large amounts of fertilizers are necessary
to maintain high crop yields year after year.
C. Nitrate and phosphate runoff cause
eutrophication in different communities.
D. Phosphates are obtained exclusively
through mining.
E. If the human production of fixed nitrogen
stopped, the amount of fixed nitrogen added
to the biosphere each year would only be
about half of what it is now.
A
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