When did scientists begin to notice changes in ecosystems as a result of climate change?
A) 250 years ago
B) 100 years ago
C) 50 years ago
D) 20 years ago
E) within the past 5 years
Correct Answer:
Verified
Q45: All of the following are true of
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Q49: Which is NOT true of greenhouse gases?
A)
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Q52: Scientists have used all of the following
Q53: Which statement is FALSE?
A) Earth would be
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