To with the food shortage in haiti how should agriculture assistance programs shift their focus

In 1 or 2 sentences, define nationalism and give an example.

What two properties affect the density of ocean water

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.