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Ais a survey that focuses on only a small portion of the population, and the results are generalized for the larger population.

What evidence does the writer give to support his argument about coral reefs? a) he speaks of the activities of coral polyps. b) he describes the composition of the great barrier reef. c) he emphasizes the ways in which coral reefs are fragile. d) he points out the ways that scientists do research on the reefs.

Irelanda. populationb. square mileagec. average population density per square mile