Which would have more erosion a dune found in the desert or a steep hill with lot of vegetion

What does macbeth see on his way to kill the king?

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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.