Forests are generally regarded as CO2
A) sources.
B) sinks.
C) both a source and a sink.
D) none of the choices
Correct Answer:
Verified
Q25: Biological nitrogen fixation is carried out _.
A)by
Q29: Ecologists have documented the extinction over the
Q30: A major fully reduced form of carbon,important
Q32: When nitrate is reduced to dinitrogen gas
Q32: The oxidized form of inorganic iron that
Q35: Bacterioplankton (floating bacteria)use _ as a sulfur
Q35: In the anammox process
A)anaerobic oxidation of ammonia
Q38: The process of denitrification involves the transformation
Q38: Since the beginning of the twentieth century,the
Q40: The manufacture of fertilizer is an energy-intensive
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