Forests are generally regarded as CO2 ______.
A) sources
B) sinks
C) both a source and a sink
D) None of the choices are correct.
Correct Answer:
Verified
Q17: Microbes sometimes make metals such as mercury
Q18: Which of the following does not contribute
Q19: The process of nitrogen fixation involves the
Q20: Which of the following is not an
Q21: Sulfate and sulfite reductions carried out by
Q23: When nitrate is reduced to dinitrogen gas
Q24: Biomagnification involves compounds having higher relative concentrations
Q25: Biological nitrogen fixation is carried out _.
A)by
Q26: Since the beginning of the twentieth century,the
Q27: Since the beginning of the twentieth century,the
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