APFIVE Ranking Natural Carbon Dioxide Sources
When comparing natural sources of atmospheric CO2, which of the following correctly ranks three major natural sources from highest to lowest in terms of annual global carbon contribution?
A
Ocean outgassing > volcanic activity > respiration
B
Volcanic activity > respiration > ocean outgassing
C
Respiration > volcanic activity > ocean outgassing
D
Respiration > ocean outgassing > volcanic activity
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