In comparison to past estimates, extinction rates are currently high. Which of the following is the most plausible explanation?
A) Natural fluctuations in climate causes extinctions.
B) Continental drift is causing rapid changes in climate, which, in turn, causes extinctions.
C) Previous extinctions make survival of contemporary species more difficult.
D) Humans are affecting many aspects of the global environment.
Correct Answer:
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Q26: Atmospheric scientists anticipate a 3.5°C temperature rise
Q27: Carbon dioxide levels are increasing because
A)human agriculture
Q29: Which of the following cycles appears to
Q30: What characteristics would you expect to find
Q31: The addition of carbon dioxide to the
Q33: The levels of carbon dioxide in the
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