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Biology 8 Online
OpenStudy (anonymous):

Two different scientists were studying the carbon levels of the air above a large city. They both found that the levels had increased by an average of 8% in the past decade. Scientist 1 concluded that the increase was a result of the increasing population of the city. Scientist 2 concluded that the increase was a result of an active volcano several miles from the city. Which scientist's conclusion is valid?

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