What is meant by Green Revolution?

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.

Which was not a country that massively built up its navy in the early 1900s? germany china united statesbritain

What border separates sonora and chihuahua national border state border physical boundary natural boundary