What are two features of coral reefs?

coral reefs are communities of hundreds of thousands of tiny animals called coral polyps. ... The reefs are built up as new corals attach atop the skeletons of dead animals. These coral reefs play a fundamental role in protecting coastlines from erosion and contribute to the formation of white sandy beaches.

Explanation:

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answer: 20 percent

the fish culture has become a developing commercial practice in developing countries which is already prominent in developed countries of the world. the major fish protein demand is being supplemented in developing countries is   fishing to meet the needs of the growing population. therefore, in some developing nations, the percentage of animal protein from fish in the diet can be as high as 20 percent.