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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 are the answers for the following questions?

Read the article titled "castro resigns." why did the us impose trade sanctions against cuba in 1962?