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不定项选择题What is the relationship between zooxanthella and coral polyps?

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1Which of the following reefs is probably an atoll?

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2In the lecture, the professor explains coral reefs. Indicate whether each of the following is a true statement about coral reefs. Click in the correct box for each phrase.

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3根据听到的内容，回答题。
What is the discussion mainly about?

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