What makes Egypt so valuable when it comes to the region’s agriculture? A. The Nile River flows through Egypt, providing one of the region’s largest sources of freshwater for crops and people.

(A) is the answer

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.