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"File:Mauna Loa Carbon Dioxide-en.svg." - Wikimedia Commons. N.p., n.d. Web. 29 Mar. 2016. https://commons.wikimedia.org/wiki/File%3AMauna_Loa_Carbon_Dioxide-en.svg.
Which of the following is the BEST reason for the variation in carbon dioxide concentrations seen in the graph above?
Carbon dioxide levels vary due to variations in the diffusion of carbon dioxide into and out of the ocean.
The distance between the earth and the sun varies leading to variations in carbon dioxide levels.
The gain and loss of ice in the Arctic.
The shedding and return of leaves by deciduous trees in the northern hemisphere impacting global photosynthetic rates.
The shedding and return of leaves by deciduous trees in the southern hemisphere impacting global photosynthetic rates.