Biological nitrogen fixation is carried out ______.
A) by prokaryotes and some protists
B) only by prokaryotes in symbiotic relationships with plants
C) only in totally anaerobic environments
D) only by a limited number of prokaryotes
Correct Answer:
Verified
Q20: Which of the following is not an
Q21: Sulfate and sulfite reductions carried out by
Q22: Forests are generally regarded as CO2 _.
A)sources
B)sinks
C)both
Q23: When nitrate is reduced to dinitrogen gas
Q24: Biomagnification involves compounds having higher relative concentrations
Q26: Since the beginning of the twentieth century,the
Q27: Since the beginning of the twentieth century,the
Q28: In the anammox process _.
A)anaerobic oxidation of
Q29: A single outbreak of a tropical infectious
Q30: A major fully reduced form of carbon,important
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