The current world population is.

Which of the following statements about the migration of workers to other countries is false?

What is the approximate circumference of the circle shown below? 12.2 cm

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.