The greatest contribution to the total human input of nitrogen per year in is __________.
A) Fossil fuels burning
B) Nitrogen fixation associate with agricultural crops
C) Manufacturing of synthetic fertilizer
D) Deforestation
Correct Answer:
Verified
Q36: How has human activity since the 19th
Q37: As atmospheric carbon dioxide levels have increased,the
Q38: Anthropogenic sources of methane include which of
Q39: Which of the following statements is correct?
A)
Q40: Scientists say that that the global rate
Q42: One reason why the melting of oceanic
Q43: The use of high-volume hydraulic fracturing techniques
Q44: Coastal marshes contribute little to no methane
Q45: The use of fertilizer has produced mixed
Q46: Using Figure 12.24,it appears that _ has
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