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Below is a graph tracking the monthly levels of atmospheric carbon dioxide at the Mauna Loa observatory in Hawaii from 1991 to 2007.
"Carbon Dioxide Information Analysis Center." A Search Tool for Scientific Data. N.p., n.d. Web. 10 Mar. 2016. http://mercury.ornl.gov/cdiacnew/send/query?term1=mauna%2Bloa&term1attribute=text&term6attribute=datasource&term6=cdiac&x=0&y=0#.
Which of the following provides the BEST explanation for the pattern shown in the graph?
Rates of carbon fixation by terrestrial photosynthesizers increase and decrease significantly with the summer and winter seasons.
Rates of carbon production by terrestrial heterotrophs increase and decrease significantly with the summer and winter seasons.
Global wind patterns act to circulate atmospheric gases in a way that periodically collects carbon dioxide in higher levels over land masses.
The sensor technology used at the observatory was developed 40 years ago and is faulty.