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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.

During which era in earth's history were the first insects? mesozoic precambrian cenozoic paleozoic

Less developed nations have low literacy rates. true or false