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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?

A

Carbon dioxide levels vary due to variations in the diffusion of carbon dioxide into and out of the ocean.

B

The distance between the earth and the sun varies leading to variations in carbon dioxide levels.

C

The gain and loss of ice in the Arctic.

D

The shedding and return of leaves by deciduous trees in the northern hemisphere impacting global photosynthetic rates.

E

The shedding and return of leaves by deciduous trees in the southern hemisphere impacting global photosynthetic rates.

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