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49.  Between 1990 and 2010, which greenhouse gas increased the most to the warming effect of the planet?

27.  The event in human history that changed the natural balance of the carbon cycle was the:

24.  Which statement best describes a typical food chain?

32.  Near the poles, what is generally the overriding climate factor?

PART 1

47.  Perhaps the biggest problem associated with the Endangered Species Act as it currently stands is that it:

6.  Which factors are an example of a negative feedback system?

18.  In accordance with the time hypothesis, which of the following countries would be expected to have the least species richness?

12.  An organism’s role within the structure and function of a particular community is its:

4.  Which of the following organisms would have the highest intrinsic rate of increase?