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    Exam 17: The Air We Breathe: Introducing Earths Atmosphere
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    According to Researchers, the Increase in Atmospheric Oxygen Can Be
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According to Researchers, the Increase in Atmospheric Oxygen Can Be

Question 33

Question 33

Multiple Choice

According to researchers, the increase in atmospheric oxygen can be explained primarily by


A) the appearance of cyanobacteria.
B) a decrease in volcanic activity.
C) an increase in biomass.
D) a decrease in carbon dioxide.

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