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OpenStudy (shesolitt):
The graph below depicts the percentages of oxygen and carbon dioxide in Earth’s atmosphere over time. Identify which line best represents each gas and explain your answer. (5 points) Discuss the evolution of the first living cells and how it affected the amount of each of these gases present in the atmosphere. (5 points) If the population of cyanobacteria suddenly went extinct today, predict how that might change the values of each of the gases represented on the graph. Explain your answer.
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