Reading Comprehension (RC) | Coral reefs are one of the most fragile

Experts please help -

When i started reading this passage, I got an outline that I am going to read about a paradox (while reading the second line of the first paragraph). The author is interested to explain that so do I to read that. In first passage, he explained about the Coral reef and mechanism of their survival. In the second passage, the author talked about how human interventions are contributing to the decline of Coral Reef (Explaining the Paradox).

Now while answering the first Question
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