TOEFL Listening: TPO-TOEFL听力TPO - 7NI13Z9LLT723KS1R$

Why does the professor discuss refugia? A. To explain that the location of coral within a reef affects the coral's ability to survive. B. To point out why some coral species are more susceptible to bleaching than others. C. To suggest that bleaching is not as detrimental to coral health as first thought. D. To illustrate the importance of studying coral that has a low vulnerability of bleaching.