How has desertification affected the land in Africa? Choose all that apply. es
A)
poor soil structure
B)
it improves security
C)
it creates more jobs
D)
low productivity in agriculture
E)
it forces migration for farmers and livestock

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.