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6. What is the main purpose of the lecture?
7. What point does the professor make about the cycling of carbon dioxide in the atmosphere?
8. Listen again to part of the lecture. Then answer the question.
Why does the professor say this:
9. According to the professor, what factors affect the amount of carbon dioxide in the atmosphere? Click on 2 answers.
10. According to the professor, why is the level of atmospheric carbon dioxide lowest during the summer?
11. What does the professor mean when she says this: