Bird populations have shifted north by about __________ kilometers on average since 1965.
A) 40
B) 56
C) 67
D) 78
Correct Answer:
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Q65: Scientists measure atmospheric carbon dioxide levels from
Q66: Earth's average temperature is now higher than
Q67: The last time temperatures were warmer than
Q68: The Keeling curve shows measurements of _.
A)carbon
Q69: The Younger Dryas event is used as
Q71: By the year 2100, higher estimates of
Q72: The precession component of a Milankovitch forcing
Q73: The oceans have absorbed about _ percent
Q74: In order to meet the goals of
Q75: There have been about _ glacial-interglacial cycles
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