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Question
The reports from Mauna Loa demonstrated ________.A) an increase in CO2 from the 1950s to the present
B) that sediments deposited on the seafloor can yield clues about past climates
C) that as distances from cities decreased, CO2 concentrations increased
D) that CO2 levels have been stable over the last 40 years
E) the presence of El Nio
Answer
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