Biomagnification involves compounds having higher relative concentrations in ______.
A) lower trophic levels
B) higher trophic levels
C) top consumers
D) top consumers or higher trophic levels
Correct Answer:
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Q19: The process of nitrogen fixation involves the
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
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
Q28: In the anammox process _.
A)anaerobic oxidation of
Q29: A single outbreak of a tropical infectious
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