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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.

What factors britain to become an industrial and commercial power?

Describe the four major spheres of the earth system; identify the parts of the earth they each represent. explain what is meant by the "earth system."