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6. What is the lecture mainly about?
7. Why does the professor say this:
8. Listen again to part of the discussion. Then answer the question.
Why does the professor say this:
9. Listen again to part of the discussion. Then answer the question.
What does the professor imply when he says this:
10. What does the professor say about a method of data collection that uses a camera?
11. According to the professor, how will color data about forests be useful to researchers?