Which of the following is not true of nitrogen?
A) the atmosphere contains 78.084 percent nitrogen by volume
B) Nitrogen is very important to organisms
C) Atmospheric nitrogen is accessible directly to most organisms
D) The key link in the nitrogen cycle is bacterial action
Answer: C) Atmospheric nitrogen is accessible directly to most organisms
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What type of metamorphism would occur in this setting?
A. regional metamorphism B. extension C. contact metamorphism D. normal faulting
Someone in sub-Saharan Africa is least likely to die of ________
A) HIV/AIDS B) diarrheal diseases C) cancer D) malaria
Increased cloudiness as a result of warmer temperatures could provide both positive and negative feedbacks in the climate system
Indicate whether the statement is true or false
Which of the following did not lead to the massive end-Cretaceous mass extinction?
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